From e87388e24cb4faf8f8683b514ffed6c537b57d2b Mon Sep 17 00:00:00 2001
From: Nimisha Asthagiri <nasthagiri@edx.org>
Date: Sun, 20 Nov 2016 13:44:30 -0500
Subject: [PATCH] Grades cleanup before updating grade report

Remove deprecated SingleSectionGrader.  TNL-5987
Remove display_name and module_id from Scores objects
Update CourseGradeFactory.__init__ to not be user-specific
Update some callers to use CourseGrade class instead of "summary" dict
Remove no longer needed course_grades.py module.
Renamed django signal from GRADES_UPDATED to COURSE_GRADE_CHANGED
---
 common/djangoapps/student/views.py            |   2 +-
 common/lib/xmodule/xmodule/graders.py         | 108 +++------------
 .../lib/xmodule/xmodule/tests/test_graders.py |  95 +++++++------
 lms/djangoapps/ccx/views.py                   |  14 +-
 .../management/commands/fix_ungraded_certs.py |   8 +-
 lms/djangoapps/certificates/queue.py          |   4 +-
 .../tests/test_submitting_problems.py         |  70 ++++------
 lms/djangoapps/courseware/views/views.py      |   4 +-
 lms/djangoapps/grades/api/views.py            |   2 +-
 lms/djangoapps/grades/context.py              |  51 ++++---
 lms/djangoapps/grades/course_grades.py        |  69 ----------
 .../grades/management/commands/get_grades.py  |  12 +-
 lms/djangoapps/grades/new/course_grade.py     |  76 +++++++----
 lms/djangoapps/grades/new/subsection_grade.py |   6 +-
 lms/djangoapps/grades/progress.py             |  11 --
 lms/djangoapps/grades/scores.py               |   2 -
 lms/djangoapps/grades/signals/handlers.py     |   2 +-
 lms/djangoapps/grades/tests/test_grades.py    | 129 ++++++++----------
 lms/djangoapps/grades/tests/test_new.py       |  24 ++--
 lms/djangoapps/grades/tests/test_scores.py    |   4 +-
 lms/djangoapps/grades/tests/utils.py          |  12 +-
 .../instructor/views/gradebook_api.py         |   4 +-
 lms/djangoapps/instructor_analytics/basic.py  |   8 +-
 .../instructor_task/tests/test_integration.py |   4 +-
 lms/djangoapps/lti_provider/tasks.py          |   6 +-
 .../lti_provider/tests/test_tasks.py          |  10 +-
 openedx/core/djangoapps/credit/signals.py     |  14 +-
 .../djangoapps/credit/tests/test_signals.py   |   5 +-
 openedx/core/djangoapps/signals/signals.py    |   4 +-
 29 files changed, 302 insertions(+), 458 deletions(-)
 delete mode 100644 lms/djangoapps/grades/course_grades.py
 delete mode 100644 lms/djangoapps/grades/progress.py

diff --git a/common/djangoapps/student/views.py b/common/djangoapps/student/views.py
index 021bca08c7..8bffc4112b 100644
--- a/common/djangoapps/student/views.py
+++ b/common/djangoapps/student/views.py
@@ -404,7 +404,7 @@ def _cert_info(user, course_overview, cert_status, course_mode):  # pylint: disa
                 )
 
     if status in {'generating', 'ready', 'notpassing', 'restricted', 'auditing', 'unverified'}:
-        persisted_grade = CourseGradeFactory(user).get_persisted(course_overview)
+        persisted_grade = CourseGradeFactory().get_persisted(user, course_overview)
         if persisted_grade is not None:
             status_dict['grade'] = unicode(persisted_grade.percent)
         elif 'grade' in cert_status:
diff --git a/common/lib/xmodule/xmodule/graders.py b/common/lib/xmodule/xmodule/graders.py
index d0792ab7a8..71b7d90c8f 100644
--- a/common/lib/xmodule/xmodule/graders.py
+++ b/common/lib/xmodule/xmodule/graders.py
@@ -18,17 +18,13 @@ class ScoreBase(object):
     """
     Abstract base class for encapsulating fields of values scores.
     Field common to all scores include:
-        display_name (string) - the display name of the module
-        module_id (UsageKey) - the location of the module
         graded (boolean) - whether or not this module is graded
         attempted (boolean) - whether the module was attempted
     """
     __metaclass__ = abc.ABCMeta
 
-    def __init__(self, graded, display_name, module_id, attempted):
+    def __init__(self, graded, attempted):
         self.graded = graded
-        self.display_name = display_name
-        self.module_id = module_id
         self.attempted = attempted
 
     def __eq__(self, other):
@@ -55,10 +51,10 @@ class ProblemScore(ScoreBase):
     """
     def __init__(self, raw_earned, raw_possible, weighted_earned, weighted_possible, weight, *args, **kwargs):
         super(ProblemScore, self).__init__(*args, **kwargs)
-        self.raw_earned = raw_earned
-        self.raw_possible = raw_possible
-        self.earned = weighted_earned
-        self.possible = weighted_possible
+        self.raw_earned = float(raw_earned) if raw_earned is not None else None
+        self.raw_possible = float(raw_possible) if raw_possible is not None else None
+        self.earned = float(weighted_earned) if weighted_earned is not None else None
+        self.possible = float(weighted_possible) if weighted_possible is not None else None
         self.weight = weight
 
 
@@ -71,8 +67,8 @@ class AggregatedScore(ScoreBase):
     """
     def __init__(self, tw_earned, tw_possible, *args, **kwargs):
         super(AggregatedScore, self).__init__(*args, **kwargs)
-        self.earned = tw_earned
-        self.possible = tw_possible
+        self.earned = float(tw_earned) if tw_earned is not None else None
+        self.possible = float(tw_possible) if tw_possible is not None else None
 
 
 def float_sum(iterable):
@@ -82,11 +78,9 @@ def float_sum(iterable):
     return float(sum(iterable))
 
 
-def aggregate_scores(scores, display_name="summary", location=None):
+def aggregate_scores(scores):
     """
     scores: A list of ScoreBase objects
-    display_name: The display name for the score object
-    location: The location under which all objects in scores are located
     returns: A tuple (all_total, graded_total).
         all_total: A ScoreBase representing the total score summed over all input scores
         graded_total: A ScoreBase representing the score summed over all graded input scores
@@ -100,11 +94,11 @@ def aggregate_scores(scores, display_name="summary", location=None):
     any_attempted = any(score.attempted for score in scores)
 
     # regardless of whether it is graded
-    all_total = AggregatedScore(total_correct, total_possible, False, display_name, location, any_attempted)
+    all_total = AggregatedScore(total_correct, total_possible, False, any_attempted)
 
     # selecting only graded things
     graded_total = AggregatedScore(
-        total_correct_graded, total_possible_graded, True, display_name, location, any_attempted_graded,
+        total_correct_graded, total_possible_graded, True, any_attempted_graded,
     )
 
     return all_total, graded_total
@@ -126,9 +120,8 @@ def grader_from_conf(conf):
     This creates a CourseGrader from a configuration (such as in course_settings.py).
     The conf can simply be an instance of CourseGrader, in which case no work is done.
     More commonly, the conf is a list of dictionaries. A WeightedSubsectionsGrader
-    with AssignmentFormatGrader's or SingleSectionGrader's as subsections will be
-    generated. Every dictionary should contain the parameters for making either a
-    AssignmentFormatGrader or SingleSectionGrader, in addition to a 'weight' key.
+    with AssignmentFormatGrader's will be generated. Every dictionary should contain
+    the parameters for making an AssignmentFormatGrader, in addition to a 'weight' key.
     """
     if isinstance(conf, CourseGrader):
         return conf
@@ -137,27 +130,14 @@ def grader_from_conf(conf):
     for subgraderconf in conf:
         subgraderconf = subgraderconf.copy()
         weight = subgraderconf.pop("weight", 0)
-        # NOTE: 'name' used to exist in SingleSectionGrader. We are deprecating SingleSectionGrader
-        # and converting everything into an AssignmentFormatGrader by adding 'min_count' and
-        # 'drop_count'. AssignmentFormatGrader does not expect 'name', so if it appears
-        # in bad_args, go ahead remove it (this causes no errors). Eventually, SingleSectionGrader
-        # should be completely removed.
-        name = 'name'
         try:
             if 'min_count' in subgraderconf:
                 #This is an AssignmentFormatGrader
                 subgrader_class = AssignmentFormatGrader
-            elif name in subgraderconf:
-                #This is an SingleSectionGrader
-                subgrader_class = SingleSectionGrader
             else:
                 raise ValueError("Configuration has no appropriate grader class.")
 
             bad_args = invalid_args(subgrader_class.__init__, subgraderconf)
-            # See note above concerning 'name'.
-            if bad_args.issuperset({name}):
-                bad_args = bad_args - {name}
-                del subgraderconf[name]
             if len(bad_args) > 0:
                 log.warning("Invalid arguments for a subgrader: %s", bad_args)
                 for key in bad_args:
@@ -264,57 +244,6 @@ class WeightedSubsectionsGrader(CourseGrader):
                 'grade_breakdown': grade_breakdown}
 
 
-class SingleSectionGrader(CourseGrader):
-    """
-    This grades a single section with the format 'type' and the name 'name'.
-
-    If the name is not appropriate for the short short_label or category, they each may
-    be specified individually.
-    """
-    def __init__(self, type, name, short_label=None, category=None):  # pylint: disable=redefined-builtin
-        self.type = type
-        self.name = name
-        self.short_label = short_label or name
-        self.category = category or name
-
-    def grade(self, grade_sheet, generate_random_scores=False):
-        found_score = None
-        if self.type in grade_sheet:
-            for score in grade_sheet[self.type]:
-                if score.display_name == self.name:
-                    found_score = score
-                    break
-
-        if found_score or generate_random_scores:
-            if generate_random_scores:  	# for debugging!
-                earned = random.randint(2, 15)
-                possible = random.randint(earned, 15)
-            else:   # We found the score
-                earned = found_score.earned
-                possible = found_score.possible
-
-            percent = earned / possible
-            detail = u"{name} - {percent:.0%} ({earned:.3n}/{possible:.3n})".format(
-                name=self.name,
-                percent=percent,
-                earned=float(earned),
-                possible=float(possible)
-            )
-
-        else:
-            percent = 0.0
-            detail = u"{name} - 0% (?/?)".format(name=self.name)
-
-        breakdown = [{'percent': percent, 'label': self.short_label,
-                      'detail': detail, 'category': self.category, 'prominent': True}]
-
-        return {
-            'percent': percent,
-            'section_breakdown': breakdown,
-            #No grade_breakdown here
-        }
-
-
 class AssignmentFormatGrader(CourseGrader):
     """
     Grades all sections matching the format 'type' with an equal weight. A specified
@@ -332,9 +261,9 @@ class AssignmentFormatGrader(CourseGrader):
     hide_average is to suppress the display of the total score in this grader and instead
     only show each assignment in this grader in the breakdown.
 
-    If there is only a single assignment in this grader, then it acts like a SingleSectionGrader
-    and returns only one entry for the grader.  Since the assignment and the total are the same,
-    the total is returned but is not labeled as an average.
+    If there is only a single assignment in this grader, then it returns only one entry for the
+    grader.  Since the assignment and the total are the same, the total is returned but is not
+    labeled as an average.
 
     category should be presentable to the user, but may not appear. When the grade breakdown is
     displayed, scores from the same category will be similar (for example, by color).
@@ -401,8 +330,8 @@ class AssignmentFormatGrader(CourseGrader):
                     section_name = "Generated"
 
                 else:
-                    earned = scores[i].earned
-                    possible = scores[i].possible
+                    earned = scores[i].graded_total.earned
+                    possible = scores[i].graded_total.possible
                     section_name = scores[i].display_name
 
                 percentage = earned / possible
@@ -442,8 +371,7 @@ class AssignmentFormatGrader(CourseGrader):
 
         if len(breakdown) == 1:
             # if there is only one entry in a section, suppress the existing individual entry and the average,
-            # and just display a single entry for the section.  That way it acts automatically like a
-            # SingleSectionGrader.
+            # and just display a single entry for the section.
             total_detail = u"{section_type} = {percent:.0%}".format(
                 percent=total_percent,
                 section_type=self.section_type,
diff --git a/common/lib/xmodule/xmodule/tests/test_graders.py b/common/lib/xmodule/xmodule/tests/test_graders.py
index 9838f2a9fe..f41833f32e 100644
--- a/common/lib/xmodule/xmodule/tests/test_graders.py
+++ b/common/lib/xmodule/xmodule/tests/test_graders.py
@@ -1,4 +1,5 @@
 """Grading tests"""
+import ddt
 import unittest
 
 from xmodule import graders
@@ -12,13 +13,11 @@ class GradesheetTest(unittest.TestCase):
 
     def test_weighted_grading(self):
         scores = []
-        agg_fields = dict(display_name="aggregated_score", module_id=None, attempted=False)
-        prob_fields = dict(
-            display_name="problem_score", module_id=None, raw_earned=0, raw_possible=0, weight=0, attempted=False,
-        )
+        agg_fields = dict(attempted=False)
+        prob_fields = dict(raw_earned=0, raw_possible=0, weight=0, attempted=False)
 
         # No scores
-        all_total, graded_total = aggregate_scores(scores, display_name=agg_fields['display_name'])
+        all_total, graded_total = aggregate_scores(scores)
         self.assertEqual(
             all_total,
             AggregatedScore(tw_earned=0, tw_possible=0, graded=False, **agg_fields),
@@ -30,7 +29,7 @@ class GradesheetTest(unittest.TestCase):
 
         # (0/5 non-graded)
         scores.append(ProblemScore(weighted_earned=0, weighted_possible=5, graded=False, **prob_fields))
-        all_total, graded_total = aggregate_scores(scores, display_name=agg_fields['display_name'])
+        all_total, graded_total = aggregate_scores(scores)
         self.assertEqual(
             all_total,
             AggregatedScore(tw_earned=0, tw_possible=5, graded=False, **agg_fields),
@@ -44,7 +43,7 @@ class GradesheetTest(unittest.TestCase):
         prob_fields['attempted'] = True
         agg_fields['attempted'] = True
         scores.append(ProblemScore(weighted_earned=3, weighted_possible=5, graded=True, **prob_fields))
-        all_total, graded_total = aggregate_scores(scores, display_name=agg_fields['display_name'])
+        all_total, graded_total = aggregate_scores(scores)
         self.assertAlmostEqual(
             all_total,
             AggregatedScore(tw_earned=3, tw_possible=10, graded=False, **agg_fields),
@@ -56,7 +55,7 @@ class GradesheetTest(unittest.TestCase):
 
         # (0/5 non-graded) + (3/5 graded) + (2/5 graded) = 5/15 total, 5/10 graded
         scores.append(ProblemScore(weighted_earned=2, weighted_possible=5, graded=True, **prob_fields))
-        all_total, graded_total = aggregate_scores(scores, display_name=agg_fields['display_name'])
+        all_total, graded_total = aggregate_scores(scores)
         self.assertAlmostEqual(
             all_total,
             AggregatedScore(tw_earned=5, tw_possible=15, graded=False, **agg_fields),
@@ -67,6 +66,7 @@ class GradesheetTest(unittest.TestCase):
         )
 
 
+@ddt.ddt
 class GraderTest(unittest.TestCase):
     """
     Tests grader implementations
@@ -81,50 +81,37 @@ class GraderTest(unittest.TestCase):
         'Midterm': [],
     }
 
-    common_fields = dict(graded=True, module_id=None, attempted=True)
+    class MockGrade(object):
+        """
+        Mock class for SubsectionGrade object.
+        """
+        def __init__(self, graded_total, display_name):
+            self.graded_total = graded_total
+            self.display_name = display_name
+
+    common_fields = dict(graded=True, attempted=True)
     test_gradesheet = {
         'Homework': [
-            AggregatedScore(tw_earned=2, tw_possible=20.0, display_name='hw1', **common_fields),
-            AggregatedScore(tw_earned=16, tw_possible=16.0, display_name='hw2', **common_fields),
+            MockGrade(AggregatedScore(tw_earned=2, tw_possible=20.0, **common_fields), display_name='hw1'),
+            MockGrade(AggregatedScore(tw_earned=16, tw_possible=16.0, **common_fields), display_name='hw2'),
         ],
 
         # The dropped scores should be from the assignments that don't exist yet
         'Lab': [
-            AggregatedScore(tw_earned=1, tw_possible=2.0, display_name='lab1', **common_fields),  # Dropped
-            AggregatedScore(tw_earned=1, tw_possible=1.0, display_name='lab2', **common_fields),
-            AggregatedScore(tw_earned=1, tw_possible=1.0, display_name='lab3', **common_fields),
-            AggregatedScore(tw_earned=5, tw_possible=25.0, display_name='lab4', **common_fields),  # Dropped
-            AggregatedScore(tw_earned=3, tw_possible=4.0, display_name='lab5', **common_fields),  # Dropped
-            AggregatedScore(tw_earned=6, tw_possible=7.0, display_name='lab6', **common_fields),
-            AggregatedScore(tw_earned=5, tw_possible=6.0, display_name='lab7', **common_fields),
+            MockGrade(AggregatedScore(tw_earned=1, tw_possible=2.0, **common_fields), display_name='lab1'),  # Dropped
+            MockGrade(AggregatedScore(tw_earned=1, tw_possible=1.0, **common_fields), display_name='lab2'),
+            MockGrade(AggregatedScore(tw_earned=1, tw_possible=1.0, **common_fields), display_name='lab3'),
+            MockGrade(AggregatedScore(tw_earned=5, tw_possible=25.0, **common_fields), display_name='lab4'),  # Dropped
+            MockGrade(AggregatedScore(tw_earned=3, tw_possible=4.0, **common_fields), display_name='lab5'),  # Dropped
+            MockGrade(AggregatedScore(tw_earned=6, tw_possible=7.0, **common_fields), display_name='lab6'),
+            MockGrade(AggregatedScore(tw_earned=5, tw_possible=6.0, **common_fields), display_name='lab7'),
         ],
 
         'Midterm': [
-            AggregatedScore(tw_earned=50.5, tw_possible=100, display_name="Midterm Exam", **common_fields),
+            MockGrade(AggregatedScore(tw_earned=50.5, tw_possible=100, **common_fields), display_name="Midterm Exam"),
         ],
     }
 
-    def test_single_section_grader(self):
-        midterm_grader = graders.SingleSectionGrader("Midterm", "Midterm Exam")
-        lab4_grader = graders.SingleSectionGrader("Lab", "lab4")
-        bad_lab_grader = graders.SingleSectionGrader("Lab", "lab42")
-
-        for graded in [
-                midterm_grader.grade(self.empty_gradesheet),
-                midterm_grader.grade(self.incomplete_gradesheet),
-                bad_lab_grader.grade(self.test_gradesheet),
-        ]:
-            self.assertEqual(len(graded['section_breakdown']), 1)
-            self.assertEqual(graded['percent'], 0.0)
-
-        graded = midterm_grader.grade(self.test_gradesheet)
-        self.assertAlmostEqual(graded['percent'], 0.505)
-        self.assertEqual(len(graded['section_breakdown']), 1)
-
-        graded = lab4_grader.grade(self.test_gradesheet)
-        self.assertAlmostEqual(graded['percent'], 0.2)
-        self.assertEqual(len(graded['section_breakdown']), 1)
-
     def test_assignment_format_grader(self):
         homework_grader = graders.AssignmentFormatGrader("Homework", 12, 2)
         no_drop_grader = graders.AssignmentFormatGrader("Homework", 12, 0)
@@ -179,8 +166,6 @@ class GraderTest(unittest.TestCase):
         # First, a few sub graders
         homework_grader = graders.AssignmentFormatGrader("Homework", 12, 2)
         lab_grader = graders.AssignmentFormatGrader("Lab", 7, 3)
-        # phasing out the use of SingleSectionGraders, and instead using AssignmentFormatGraders that
-        # will act like SingleSectionGraders on single sections.
         midterm_grader = graders.AssignmentFormatGrader("Midterm", 1, 0)
 
         weighted_grader = graders.WeightedSubsectionsGrader([
@@ -268,6 +253,8 @@ class GraderTest(unittest.TestCase):
             },
             {
                 'type': "Midterm",
+                'min_count': 0,
+                'drop_count': 0,
                 'name': "Midterm Exam",
                 'short_label': "Midterm",
                 'weight': 0.5,
@@ -294,5 +281,25 @@ class GraderTest(unittest.TestCase):
         self.assertAlmostEqual(graded['percent'], 0.11)
         self.assertEqual(len(graded['section_breakdown']), 12 + 1)
 
-        # TODO: How do we test failure cases? The parser only logs an error when
-        # it can't parse something. Maybe it should throw exceptions?
+    @ddt.data(
+        # empty
+        (
+            {},
+            u"Configuration has no appropriate grader class."
+        ),
+        # no min_count
+        (
+            {'type': "Homework", 'drop_count': 0},
+            u"Configuration has no appropriate grader class."
+        ),
+        # no drop_count
+        (
+            {'type': "Homework", 'min_count': 0},
+            u"__init__() takes at least 4 arguments (3 given)"
+        ),
+    )
+    @ddt.unpack
+    def test_grader_with_invalid_conf(self, invalid_conf, expected_error_message):
+        with self.assertRaises(ValueError) as error:
+            graders.grader_from_conf([invalid_conf])
+        self.assertIn(expected_error_message, error.exception.message)
diff --git a/lms/djangoapps/ccx/views.py b/lms/djangoapps/ccx/views.py
index 85ea5f494d..4d4396bb8c 100644
--- a/lms/djangoapps/ccx/views.py
+++ b/lms/djangoapps/ccx/views.py
@@ -33,7 +33,7 @@ from courseware.field_overrides import disable_overrides
 from django_comment_common.models import FORUM_ROLE_ADMINISTRATOR, assign_role
 from django_comment_common.utils import seed_permissions_roles
 from edxmako.shortcuts import render_to_response
-from lms.djangoapps.grades.course_grades import iterate_grades_for
+from lms.djangoapps.grades.new.course_grade import CourseGradeFactory
 from opaque_keys.edx.keys import CourseKey
 from ccx_keys.locator import CCXLocator
 from student.roles import CourseCcxCoachRole
@@ -564,30 +564,30 @@ def ccx_grades_csv(request, course, ccx=None):
             courseenrollment__course_id=ccx_key,
             courseenrollment__is_active=1
         ).order_by('username').select_related("profile")
-        grades = iterate_grades_for(course, enrolled_students)
+        grades = CourseGradeFactory().iter(course, enrolled_students)
 
         header = None
         rows = []
-        for student, gradeset, __ in grades:
-            if gradeset:
+        for student, course_grade, __ in grades:
+            if course_grade:
                 # We were able to successfully grade this student for this
                 # course.
                 if not header:
                     # Encode the header row in utf-8 encoding in case there are
                     # unicode characters
                     header = [section['label'].encode('utf-8')
-                              for section in gradeset[u'section_breakdown']]
+                              for section in course_grade.summary[u'section_breakdown']]
                     rows.append(["id", "email", "username", "grade"] + header)
 
                 percents = {
                     section['label']: section.get('percent', 0.0)
-                    for section in gradeset[u'section_breakdown']
+                    for section in course_grade.summary[u'section_breakdown']
                     if 'label' in section
                 }
 
                 row_percents = [percents.get(label, 0.0) for label in header]
                 rows.append([student.id, student.email, student.username,
-                             gradeset['percent']] + row_percents)
+                             course_grade.percent] + row_percents)
 
         buf = StringIO()
         writer = csv.writer(buf)
diff --git a/lms/djangoapps/certificates/management/commands/fix_ungraded_certs.py b/lms/djangoapps/certificates/management/commands/fix_ungraded_certs.py
index f7967e15bf..dbf8c85901 100644
--- a/lms/djangoapps/certificates/management/commands/fix_ungraded_certs.py
+++ b/lms/djangoapps/certificates/management/commands/fix_ungraded_certs.py
@@ -5,7 +5,7 @@ Management command which fixes ungraded certificates for students
 
 from certificates.models import GeneratedCertificate
 from courseware import courses
-from lms.djangoapps.grades import course_grades
+from lms.djangoapps.grades.new.course_grade import CourseGradeFactory
 from django.test.client import RequestFactory
 from django.core.management.base import BaseCommand
 from optparse import make_option
@@ -52,8 +52,8 @@ class Command(BaseCommand):
 
         for cert in ungraded:
             # grade the student
-            grade = course_grades.summary(cert.user, course)
-            print "grading {0} - {1}".format(cert.user, grade['percent'])
-            cert.grade = grade['percent']
+            grade = CourseGradeFactory().create(cert.user, course)
+            print "grading {0} - {1}".format(cert.user, grade.percent)
+            cert.grade = grade.percent
             if not options['noop']:
                 cert.save()
diff --git a/lms/djangoapps/certificates/queue.py b/lms/djangoapps/certificates/queue.py
index 2018a88574..005b161d4a 100644
--- a/lms/djangoapps/certificates/queue.py
+++ b/lms/djangoapps/certificates/queue.py
@@ -11,7 +11,7 @@ from django.conf import settings
 from django.core.urlresolvers import reverse
 from requests.auth import HTTPBasicAuth
 
-from lms.djangoapps.grades import course_grades
+from lms.djangoapps.grades.new.course_grade import CourseGradeFactory
 from xmodule.modulestore.django import modulestore
 from capa.xqueue_interface import XQueueInterface
 from capa.xqueue_interface import make_xheader, make_hashkey
@@ -271,7 +271,7 @@ class XQueueCertInterface(object):
         self.request.session = {}
 
         is_whitelisted = self.whitelist.filter(user=student, course_id=course_id, whitelist=True).exists()
-        grade = course_grades.summary(student, course)
+        grade = CourseGradeFactory().create(student, course).summary
         enrollment_mode, __ = CourseEnrollment.enrollment_mode_for_user(student, course_id)
         mode_is_verified = enrollment_mode in GeneratedCertificate.VERIFIED_CERTS_MODES
         user_is_verified = SoftwareSecurePhotoVerification.user_is_verified(student)
diff --git a/lms/djangoapps/courseware/tests/test_submitting_problems.py b/lms/djangoapps/courseware/tests/test_submitting_problems.py
index 81f3864a35..d8482f04e2 100644
--- a/lms/djangoapps/courseware/tests/test_submitting_problems.py
+++ b/lms/djangoapps/courseware/tests/test_submitting_problems.py
@@ -22,7 +22,7 @@ from capa.tests.response_xml_factory import (
 from course_modes.models import CourseMode
 from courseware.models import StudentModule, BaseStudentModuleHistory
 from courseware.tests.helpers import LoginEnrollmentTestCase
-from lms.djangoapps.grades import course_grades, progress
+from lms.djangoapps.grades.new.course_grade import CourseGradeFactory
 from openedx.core.djangoapps.credit.api import (
     set_credit_requirements, get_credit_requirement_status
 )
@@ -270,39 +270,17 @@ class TestSubmittingProblems(ModuleStoreTestCase, LoginEnrollmentTestCase, Probl
         self.update_course(self.course, self.student_user.id)
         self.refresh_course()
 
-    def get_grade_summary(self):
+    def get_course_grade(self):
         """
-        calls course_grades.summary for current user and course.
-
-        the keywords for the returned object are
-        - grade : A final letter grade.
-        - percent : The final percent for the class (rounded up).
-        - section_breakdown : A breakdown of each section that makes
-            up the grade. (For display)
-        - grade_breakdown : A breakdown of the major components that
-            make up the final grade. (For display)
+        Return CourseGrade for current user and course.
         """
-        return course_grades.summary(self.student_user, self.course)
-
-    def get_progress_summary(self):
-        """
-        Return progress summary structure for current user and course.
-
-        Returns
-        - courseware_summary is a summary of all sections with problems in the course.
-        It is organized as an array of chapters, each containing an array of sections,
-        each containing an array of scores. This contains information for graded and
-        ungraded problems, and is good for displaying a course summary with due dates,
-        etc.
-        """
-        return progress.summary(self.student_user, self.course).chapter_grades
+        return CourseGradeFactory().create(self.student_user, self.course)
 
     def check_grade_percent(self, percent):
         """
         Assert that percent grade is as expected.
         """
-        grade_summary = self.get_grade_summary()
-        self.assertEqual(grade_summary['percent'], percent)
+        self.assertEqual(self.get_course_grade().percent, percent)
 
     def earned_hw_scores(self):
         """
@@ -310,7 +288,7 @@ class TestSubmittingProblems(ModuleStoreTestCase, LoginEnrollmentTestCase, Probl
 
         Returns list of scores: [<points on hw_1>, <points on hw_2>, ..., <points on hw_n>]
         """
-        return [s.earned for s in self.get_grade_summary()['totaled_scores']['Homework']]
+        return [s.graded_total.earned for s in self.get_course_grade().graded_subsections_by_format['Homework']]
 
     def hw_grade(self, hw_url_name):
         """
@@ -318,7 +296,7 @@ class TestSubmittingProblems(ModuleStoreTestCase, LoginEnrollmentTestCase, Probl
         """
         # list of grade summaries for each section
         sections_list = []
-        for chapter in self.get_progress_summary():
+        for chapter in self.get_course_grade().chapter_grades:
             sections_list.extend(chapter['sections'])
 
         # get the first section that matches the url (there should only be one)
@@ -431,8 +409,11 @@ class TestCourseGrader(TestSubmittingProblems):
                     "drop_count": 0,
                     "short_label": "HW",
                     "weight": hw_weight
-                }, {
+                },
+                {
                     "type": "Final",
+                    "min_count": 0,
+                    "drop_count": 0,
                     "name": "Final Section",
                     "short_label": "Final",
                     "weight": final_weight
@@ -558,7 +539,7 @@ class TestCourseGrader(TestSubmittingProblems):
         """
         self.basic_setup()
         self.check_grade_percent(0)
-        self.assertEqual(self.get_grade_summary()['grade'], None)
+        self.assertEqual(self.get_course_grade().letter_grade, None)
 
     def test_b_grade_exact(self):
         """
@@ -567,7 +548,7 @@ class TestCourseGrader(TestSubmittingProblems):
         self.basic_setup()
         self.submit_question_answer('p1', {'2_1': 'Correct'})
         self.check_grade_percent(0.33)
-        self.assertEqual(self.get_grade_summary()['grade'], 'B')
+        self.assertEqual(self.get_course_grade().letter_grade, 'B')
 
     def test_b_grade_above(self):
         """
@@ -577,7 +558,7 @@ class TestCourseGrader(TestSubmittingProblems):
         self.submit_question_answer('p1', {'2_1': 'Correct'})
         self.submit_question_answer('p2', {'2_1': 'Correct'})
         self.check_grade_percent(0.67)
-        self.assertEqual(self.get_grade_summary()['grade'], 'B')
+        self.assertEqual(self.get_course_grade().letter_grade, 'B')
 
     def test_a_grade(self):
         """
@@ -588,7 +569,7 @@ class TestCourseGrader(TestSubmittingProblems):
         self.submit_question_answer('p2', {'2_1': 'Correct'})
         self.submit_question_answer('p3', {'2_1': 'Correct'})
         self.check_grade_percent(1.0)
-        self.assertEqual(self.get_grade_summary()['grade'], 'A')
+        self.assertEqual(self.get_course_grade().letter_grade, 'A')
 
     def test_wrong_answers(self):
         """
@@ -599,7 +580,7 @@ class TestCourseGrader(TestSubmittingProblems):
         self.submit_question_answer('p2', {'2_1': 'Correct'})
         self.submit_question_answer('p3', {'2_1': 'Incorrect'})
         self.check_grade_percent(0.67)
-        self.assertEqual(self.get_grade_summary()['grade'], 'B')
+        self.assertEqual(self.get_course_grade().letter_grade, 'B')
 
     def test_submissions_api_overrides_scores(self):
         """
@@ -610,7 +591,7 @@ class TestCourseGrader(TestSubmittingProblems):
         self.submit_question_answer('p2', {'2_1': 'Correct'})
         self.submit_question_answer('p3', {'2_1': 'Incorrect'})
         self.check_grade_percent(0.67)
-        self.assertEqual(self.get_grade_summary()['grade'], 'B')
+        self.assertEqual(self.get_course_grade().letter_grade, 'B')
 
         # But now, set the score with the submissions API and watch
         # as it overrides the score read from StudentModule and our
@@ -625,7 +606,7 @@ class TestCourseGrader(TestSubmittingProblems):
         submission = submissions_api.create_submission(student_item, 'any answer')
         submissions_api.set_score(submission['uuid'], 1, 1)
         self.check_grade_percent(1.0)
-        self.assertEqual(self.get_grade_summary()['grade'], 'A')
+        self.assertEqual(self.get_course_grade().letter_grade, 'A')
 
     def test_submissions_api_anonymous_student_id(self):
         """
@@ -640,7 +621,7 @@ class TestCourseGrader(TestSubmittingProblems):
             mock_get_scores.return_value = {
                 self.problem_location('p3').to_deprecated_string(): (1, 1)
             }
-            self.get_grade_summary()
+            self.get_course_grade()
 
             # Verify that the submissions API was sent an anonymized student ID
             mock_get_scores.assert_called_with(
@@ -752,9 +733,6 @@ class TestCourseGrader(TestSubmittingProblems):
         # the Django student views, and does not update enrollment if it already exists.
         CourseEnrollment.enroll(self.student_user, self.course.id, mode)
 
-        self.submit_question_answer('p1', {'2_1': 'Correct'})
-        self.submit_question_answer('p2', {'2_1': 'Correct'})
-
         # Enable the course for credit
         CreditCourse.objects.create(course_key=self.course.id, enabled=True)
 
@@ -774,7 +752,15 @@ class TestCourseGrader(TestSubmittingProblems):
         # Add a single credit requirement (final grade)
         set_credit_requirements(self.course.id, requirements)
 
-        self.get_grade_summary()
+        # Credit requirement is not satisfied before passing grade
+        req_status = get_credit_requirement_status(self.course.id, self.student_user.username, 'grade', 'grade')
+        self.assertEqual(req_status[0]["status"], None)
+
+        self._stop_signal_patch()
+        self.submit_question_answer('p1', {'2_1': 'Correct'})
+        self.submit_question_answer('p2', {'2_1': 'Correct'})
+
+        # Credit requirement is now satisfied after passing grade
         req_status = get_credit_requirement_status(self.course.id, self.student_user.username, 'grade', 'grade')
         self.assertEqual(req_status[0]["status"], 'satisfied')
 
diff --git a/lms/djangoapps/courseware/views/views.py b/lms/djangoapps/courseware/views/views.py
index 7d2c8a0723..f4f4ba42b6 100644
--- a/lms/djangoapps/courseware/views/views.py
+++ b/lms/djangoapps/courseware/views/views.py
@@ -723,7 +723,7 @@ def _progress(request, course_key, student_id):
     # additional DB lookup (this kills the Progress page in particular).
     student = User.objects.prefetch_related("groups").get(id=student.id)
 
-    course_grade = CourseGradeFactory(student).create(course)
+    course_grade = CourseGradeFactory().create(student, course)
     courseware_summary = course_grade.chapter_grades
     grade_summary = course_grade.summary
 
@@ -1127,7 +1127,7 @@ def is_course_passed(course, grade_summary=None, student=None, request=None):
     success_cutoff = min(nonzero_cutoffs) if nonzero_cutoffs else None
 
     if grade_summary is None:
-        grade_summary = CourseGradeFactory(student).create(course).summary
+        grade_summary = CourseGradeFactory().create(student, course).summary
 
     return success_cutoff and grade_summary['percent'] >= success_cutoff
 
diff --git a/lms/djangoapps/grades/api/views.py b/lms/djangoapps/grades/api/views.py
index 24c6892928..738d2fa83a 100644
--- a/lms/djangoapps/grades/api/views.py
+++ b/lms/djangoapps/grades/api/views.py
@@ -148,7 +148,7 @@ class UserGradeView(GradeViewMixin, GenericAPIView):
             return course
 
         prep_course_for_grading(course, request)
-        course_grade = CourseGradeFactory(request.user).create(course)
+        course_grade = CourseGradeFactory().create(request.user, course)
 
         return Response([{
             'username': username,
diff --git a/lms/djangoapps/grades/context.py b/lms/djangoapps/grades/context.py
index 86cf314cce..d821fc6962 100644
--- a/lms/djangoapps/grades/context.py
+++ b/lms/djangoapps/grades/context.py
@@ -1,17 +1,17 @@
 """
 Grading Context
 """
-from collections import defaultdict
+from collections import OrderedDict
 from openedx.core.djangoapps.content.block_structure.api import get_course_in_cache
 
 from .scores import possibly_scored
 
 
-def grading_context_for_course(course):
+def grading_context_for_course(course_key):
     """
     Same as grading_context, but takes in a course object.
     """
-    course_structure = get_course_in_cache(course.id)
+    course_structure = get_course_in_cache(course_key)
     return grading_context(course_structure)
 
 
@@ -21,16 +21,13 @@ def grading_context(course_structure):
     a student. They are used by grades.grade()
 
     The grading context has two keys:
-    graded_sections - This contains the sections that are graded, as
-        well as all possible children modules that can affect the
-        grading. This allows some sections to be skipped if the student
-        hasn't seen any part of it.
+    all_graded_subsections_by_type - This contains all subsections that are
+        graded, keyed by subsection format (assignment type).
 
-        The format is a dictionary keyed by section-type. The values are
-        arrays of dictionaries containing
-            "section_block" : The section block
-            "scored_descendant_keys" : An array of usage keys for blocks
-                could possibly be in the section, for any student
+        The values are arrays of dictionaries containing
+            "subsection_block" : The subsection block
+            "scored_descendants" : An array of usage keys for blocks
+                could possibly be in the subsection, for any student
 
     all_graded_blocks - This contains a list of all blocks that can
         affect grading a student. This is used to efficiently fetch
@@ -39,34 +36,36 @@ def grading_context(course_structure):
 
     """
     all_graded_blocks = []
-    all_graded_sections = defaultdict(list)
+    all_graded_subsections_by_type = OrderedDict()
 
     for chapter_key in course_structure.get_children(course_structure.root_block_usage_key):
-        for section_key in course_structure.get_children(chapter_key):
-            section = course_structure[section_key]
-            scored_descendants_of_section = [section]
-            if section.graded:
+        for subsection_key in course_structure.get_children(chapter_key):
+            subsection = course_structure[subsection_key]
+            scored_descendants_of_subsection = []
+            if subsection.graded:
                 for descendant_key in course_structure.post_order_traversal(
                         filter_func=possibly_scored,
-                        start_node=section_key,
+                        start_node=subsection_key,
                 ):
-                    scored_descendants_of_section.append(
+                    scored_descendants_of_subsection.append(
                         course_structure[descendant_key],
                     )
 
                 # include only those blocks that have scores, not if they are just a parent
-                section_info = {
-                    'section_block': section,
+                subsection_info = {
+                    'subsection_block': subsection,
                     'scored_descendants': [
-                        child for child in scored_descendants_of_section
+                        child for child in scored_descendants_of_subsection
                         if getattr(child, 'has_score', None)
                     ]
                 }
-                section_format = getattr(section, 'format', '')
-                all_graded_sections[section_format].append(section_info)
-                all_graded_blocks.extend(scored_descendants_of_section)
+                subsection_format = getattr(subsection, 'format', '')
+                if subsection_format not in all_graded_subsections_by_type:
+                    all_graded_subsections_by_type[subsection_format] = []
+                all_graded_subsections_by_type[subsection_format].append(subsection_info)
+                all_graded_blocks.extend(scored_descendants_of_subsection)
 
     return {
-        'all_graded_sections': all_graded_sections,
+        'all_graded_subsections_by_type': all_graded_subsections_by_type,
         'all_graded_blocks': all_graded_blocks,
     }
diff --git a/lms/djangoapps/grades/course_grades.py b/lms/djangoapps/grades/course_grades.py
deleted file mode 100644
index cc5ab1f5e2..0000000000
--- a/lms/djangoapps/grades/course_grades.py
+++ /dev/null
@@ -1,69 +0,0 @@
-"""
-Functionality for course-level grades.
-"""
-from collections import namedtuple
-from logging import getLogger
-
-import dogstats_wrapper as dog_stats_api
-
-from opaque_keys.edx.keys import CourseKey
-from courseware.courses import get_course_by_id
-from .new.course_grade import CourseGradeFactory
-
-
-log = getLogger(__name__)
-
-
-GradeResult = namedtuple('GradeResult', ['student', 'gradeset', 'err_msg'])
-
-
-def iterate_grades_for(course_or_id, students):
-    """
-    Given a course_id and an iterable of students (User), yield a GradeResult
-    for every student enrolled in the course.  GradeResult is a named tuple of:
-
-    (student, gradeset, err_msg)
-
-    If an error occurred, gradeset will be an empty dict and err_msg will be an
-    exception message. If there was no error, err_msg is an empty string.
-
-    The gradeset is a dictionary with the following fields:
-
-    - grade : A final letter grade.
-    - percent : The final percent for the class (rounded up).
-        - section_breakdown : A breakdown of each section that makes
-        up the grade. (For display)
-    - grade_breakdown : A breakdown of the major components that
-        make up the final grade. (For display)
-    - raw_scores: contains scores for every graded module
-    """
-    if isinstance(course_or_id, (basestring, CourseKey)):
-        course = get_course_by_id(course_or_id)
-    else:
-        course = course_or_id
-
-    for student in students:
-        with dog_stats_api.timer('lms.grades.iterate_grades_for', tags=[u'action:{}'.format(course.id)]):
-            try:
-                gradeset = summary(student, course)
-                yield GradeResult(student, gradeset, "")
-            except Exception as exc:  # pylint: disable=broad-except
-                # Keep marching on even if this student couldn't be graded for
-                # some reason, but log it for future reference.
-                log.exception(
-                    'Cannot grade student %s (%s) in course %s because of exception: %s',
-                    student.username,
-                    student.id,
-                    course.id,
-                    exc.message
-                )
-                yield GradeResult(student, {}, exc.message)
-
-
-def summary(student, course):
-    """
-    Returns the grade summary of the student for the given course.
-
-    Also sends a signal to update the minimum grade requirement status.
-    """
-    return CourseGradeFactory(student).create(course).summary
diff --git a/lms/djangoapps/grades/management/commands/get_grades.py b/lms/djangoapps/grades/management/commands/get_grades.py
index f380fa3522..c6b5525a74 100644
--- a/lms/djangoapps/grades/management/commands/get_grades.py
+++ b/lms/djangoapps/grades/management/commands/get_grades.py
@@ -7,7 +7,7 @@ from django.core.management.base import BaseCommand, CommandError
 import os
 from lms.djangoapps.courseware import courses
 from lms.djangoapps.certificates.models import GeneratedCertificate
-from lms.djangoapps.grades import course_grades
+from lms.djangoapps.grades.new.course_grade import CourseGradeFactory
 from opaque_keys import InvalidKeyError
 from opaque_keys.edx.keys import CourseKey
 from opaque_keys.edx.locations import SlashSeparatedCourseKey
@@ -124,18 +124,18 @@ class Command(BaseCommand):
                     count, total, hours, minutes)
                 start = datetime.datetime.now()
             request.user = student
-            grade = course_grades.summary(student, course)
+            grade = CourseGradeFactory().create(student, course)
             if not header:
-                header = [section['label'] for section in grade[u'section_breakdown']]
+                header = [section['label'] for section in grade.summary[u'section_breakdown']]
                 rows.append(["email", "username", "certificate-grade", "grade"] + header)
-            percents = {section['label']: section['percent'] for section in grade[u'section_breakdown']}
+            percents = {section['label']: section['percent'] for section in grade.summary[u'section_breakdown']}
             row_percents = [percents[label] for label in header]
             if student.username in cert_grades:
                 rows.append(
-                    [student.email, student.username, cert_grades[student.username], grade['percent']] + row_percents,
+                    [student.email, student.username, cert_grades[student.username], grade.percent] + row_percents,
                 )
             else:
-                rows.append([student.email, student.username, "N/A", grade['percent']] + row_percents)
+                rows.append([student.email, student.username, "N/A", grade.percent] + row_percents)
         with open(options['output'], 'wb') as f:
             writer = csv.writer(f)
             writer.writerows(rows)
diff --git a/lms/djangoapps/grades/new/course_grade.py b/lms/djangoapps/grades/new/course_grade.py
index b87be568ba..5688e4d3ec 100644
--- a/lms/djangoapps/grades/new/course_grade.py
+++ b/lms/djangoapps/grades/new/course_grade.py
@@ -3,15 +3,17 @@ CourseGrade Class
 """
 
 from collections import defaultdict
+from collections import namedtuple
 from logging import getLogger
 
 from django.conf import settings
 from django.core.exceptions import PermissionDenied
+import dogstats_wrapper as dog_stats_api
 from lazy import lazy
 
 from lms.djangoapps.course_blocks.api import get_course_blocks
 from lms.djangoapps.grades.config.models import PersistentGradesEnabledFlag
-from openedx.core.djangoapps.signals.signals import GRADES_UPDATED
+from openedx.core.djangoapps.signals.signals import COURSE_GRADE_CHANGED
 from xmodule import block_metadata_utils
 
 from ..models import PersistentCourseGrade
@@ -37,7 +39,7 @@ class CourseGrade(object):
         self._subsection_grade_factory = SubsectionGradeFactory(self.student, self.course, self.course_structure)
 
     @lazy
-    def subsection_grade_totals_by_format(self):
+    def graded_subsections_by_format(self):
         """
         Returns grades for the subsections in the course in
         a dict keyed by subsection format types.
@@ -48,7 +50,7 @@ class CourseGrade(object):
                 if subsection_grade.graded:
                     graded_total = subsection_grade.graded_total
                     if graded_total.possible > 0:
-                        subsections_by_format[subsection_grade.format].append(graded_total)
+                        subsections_by_format[subsection_grade.format].append(subsection_grade)
         return subsections_by_format
 
     @lazy
@@ -70,7 +72,7 @@ class CourseGrade(object):
         # Grading policy might be overriden by a CCX, need to reset it
         self.course.set_grading_policy(self.course.grading_policy)
         grade_value = self.course.grader.grade(
-            self.subsection_grade_totals_by_format,
+            self.graded_subsections_by_format,
             generate_random_scores=settings.GENERATE_PROFILE_SCORES
         )
         # can't use the existing properties due to recursion issues caused by referencing self.grade_value
@@ -137,8 +139,6 @@ class CourseGrade(object):
         grade_summary = self.grade_value
         grade_summary['percent'] = self.percent
         grade_summary['grade'] = self.letter_grade
-        grade_summary['totaled_scores'] = self.subsection_grade_totals_by_format
-        grade_summary['raw_scores'] = list(self.locations_to_scores.itervalues())
 
         return grade_summary
 
@@ -150,7 +150,7 @@ class CourseGrade(object):
         """
         subsections_total = sum(len(chapter['sections']) for chapter in self.chapter_grades)
 
-        total_graded_subsections = sum(len(x) for x in self.subsection_grade_totals_by_format.itervalues())
+        total_graded_subsections = sum(len(x) for x in self.graded_subsections_by_format.itervalues())
         subsections_created = len(self._subsection_grade_factory._unsaved_subsection_grades)  # pylint: disable=protected-access
         subsections_read = subsections_total - subsections_created
         blocks_total = len(self.locations_to_scores)
@@ -295,10 +295,10 @@ class CourseGrade(object):
         """
         Signal all listeners when grades are computed.
         """
-        responses = GRADES_UPDATED.send_robust(
+        responses = COURSE_GRADE_CHANGED.send_robust(
             sender=None,
             user=self.student,
-            grade_summary=self.summary,
+            course_grade=self,
             course_key=self.course.id,
             deadline=self.course.end
         )
@@ -324,32 +324,60 @@ class CourseGradeFactory(object):
     """
     Factory class to create Course Grade objects
     """
-    def __init__(self, student):
-        self.student = student
-
-    def create(self, course, read_only=True):
+    def create(self, student, course, read_only=True):
         """
         Returns the CourseGrade object for the given student and course.
 
         If read_only is True, doesn't save any updates to the grades.
         Raises a PermissionDenied if the user does not have course access.
         """
-        course_structure = get_course_blocks(self.student, course.location)
+        course_structure = get_course_blocks(student, course.location)
         # if user does not have access to this course, throw an exception
         if not self._user_has_access_to_course(course_structure):
             raise PermissionDenied("User does not have access to this course")
         return (
-            self._get_saved_grade(course, course_structure) or
-            self._compute_and_update_grade(course, course_structure, read_only)
+            self._get_saved_grade(student, course, course_structure) or
+            self._compute_and_update_grade(student, course, course_structure, read_only)
         )
 
-    def update(self, course, course_structure):
+    GradeResult = namedtuple('GradeResult', ['student', 'course_grade', 'err_msg'])
+
+    def iter(self, course, students):
+        """
+        Given a course and an iterable of students (User), yield a GradeResult
+        for every student enrolled in the course.  GradeResult is a named tuple of:
+
+            (student, course_grade, err_msg)
+
+        If an error occurred, course_grade will be None and err_msg will be an
+        exception message. If there was no error, err_msg is an empty string.
+        """
+        for student in students:
+            with dog_stats_api.timer('lms.grades.CourseGradeFactory.iter', tags=[u'action:{}'.format(course.id)]):
+
+                try:
+                    course_grade = CourseGradeFactory().create(student, course)
+                    yield self.GradeResult(student, course_grade, "")
+
+                except Exception as exc:  # pylint: disable=broad-except
+                    # Keep marching on even if this student couldn't be graded for
+                    # some reason, but log it for future reference.
+                    log.exception(
+                        'Cannot grade student %s (%s) in course %s because of exception: %s',
+                        student.username,
+                        student.id,
+                        course.id,
+                        exc.message
+                    )
+                    yield self.GradeResult(student, None, exc.message)
+
+    def update(self, student, course, course_structure):
         """
         Updates the CourseGrade for this Factory's student.
         """
-        self._compute_and_update_grade(course, course_structure)
+        self._compute_and_update_grade(student, course, course_structure)
 
-    def get_persisted(self, course):
+    def get_persisted(self, student, course):
         """
         Returns the saved grade for the given course and student,
         irrespective of whether the saved grade is up-to-date.
@@ -357,9 +385,9 @@ class CourseGradeFactory(object):
         if not PersistentGradesEnabledFlag.feature_enabled(course.id):
             return None
 
-        return CourseGrade.get_persisted_grade(self.student, course)
+        return CourseGrade.get_persisted_grade(student, course)
 
-    def _get_saved_grade(self, course, course_structure):
+    def _get_saved_grade(self, student, course, course_structure):
         """
         Returns the saved grade for the given course and student.
         """
@@ -367,18 +395,18 @@ class CourseGradeFactory(object):
             return None
 
         return CourseGrade.load_persisted_grade(
-            self.student,
+            student,
             course,
             course_structure
         )
 
-    def _compute_and_update_grade(self, course, course_structure, read_only=False):
+    def _compute_and_update_grade(self, student, course, course_structure, read_only=False):
         """
         Freshly computes and updates the grade for the student and course.
 
         If read_only is True, doesn't save any updates to the grades.
         """
-        course_grade = CourseGrade(self.student, course, course_structure)
+        course_grade = CourseGrade(student, course, course_structure)
         course_grade.compute_and_update(read_only)
         return course_grade
 
diff --git a/lms/djangoapps/grades/new/subsection_grade.py b/lms/djangoapps/grades/new/subsection_grade.py
index 9e4b601aa1..ebd5867ff6 100644
--- a/lms/djangoapps/grades/new/subsection_grade.py
+++ b/lms/djangoapps/grades/new/subsection_grade.py
@@ -68,7 +68,7 @@ class SubsectionGrade(object):
         ):
             self._compute_block_score(descendant_key, course_structure, submissions_scores, csm_scores)
 
-        self.all_total, self.graded_total = graders.aggregate_scores(self.scores, self.display_name, self.location)
+        self.all_total, self.graded_total = graders.aggregate_scores(self.scores)
         self._log_event(log.debug, u"init_from_structure", student)
         return self
 
@@ -83,16 +83,12 @@ class SubsectionGrade(object):
             tw_earned=model.earned_graded,
             tw_possible=model.possible_graded,
             graded=True,
-            display_name=self.display_name,
-            module_id=self.location,
             attempted=model.first_attempted is not None,
         )
         self.all_total = AggregatedScore(
             tw_earned=model.earned_all,
             tw_possible=model.possible_all,
             graded=False,
-            display_name=self.display_name,
-            module_id=self.location,
             attempted=model.first_attempted is not None,
         )
         self._log_event(log.debug, u"init_from_model", student)
diff --git a/lms/djangoapps/grades/progress.py b/lms/djangoapps/grades/progress.py
deleted file mode 100644
index 7e58c86b77..0000000000
--- a/lms/djangoapps/grades/progress.py
+++ /dev/null
@@ -1,11 +0,0 @@
-"""
-Progress Summary of a learner's course grades.
-"""
-from .new.course_grade import CourseGradeFactory
-
-
-def summary(student, course):
-    """
-    Returns the CourseGrade for the given course and student.
-    """
-    return CourseGradeFactory(student).create(course)
diff --git a/lms/djangoapps/grades/scores.py b/lms/djangoapps/grades/scores.py
index ca1d4865a4..305b61ce8e 100644
--- a/lms/djangoapps/grades/scores.py
+++ b/lms/djangoapps/grades/scores.py
@@ -122,8 +122,6 @@ def get_score(submissions_scores, csm_scores, persisted_block, block):
             weighted_possible,
             weight,
             graded,
-            display_name=display_name_with_default_escaped(block),
-            module_id=block.location,
             attempted=attempted,
         )
 
diff --git a/lms/djangoapps/grades/signals/handlers.py b/lms/djangoapps/grades/signals/handlers.py
index d0c9c5f744..0b52aab452 100644
--- a/lms/djangoapps/grades/signals/handlers.py
+++ b/lms/djangoapps/grades/signals/handlers.py
@@ -182,4 +182,4 @@ def recalculate_course_grade(sender, course, course_structure, user, **kwargs):
     """
     Updates a saved course grade.
     """
-    CourseGradeFactory(user).update(course, course_structure)
+    CourseGradeFactory().update(user, course, course_structure)
diff --git a/lms/djangoapps/grades/tests/test_grades.py b/lms/djangoapps/grades/tests/test_grades.py
index 162fb0bee4..b1edde1da5 100644
--- a/lms/djangoapps/grades/tests/test_grades.py
+++ b/lms/djangoapps/grades/tests/test_grades.py
@@ -3,11 +3,9 @@ Test grade calculation.
 """
 
 import ddt
-from django.http import Http404
 import itertools
 from mock import patch
 from nose.plugins.attrib import attr
-from opaque_keys.edx.locations import SlashSeparatedCourseKey
 
 from capa.tests.response_xml_factory import MultipleChoiceResponseXMLFactory
 from courseware.model_data import set_score
@@ -17,49 +15,21 @@ from lms.djangoapps.course_blocks.api import get_course_blocks
 from openedx.core.djangolib.testing.utils import get_mock_request
 from student.tests.factories import UserFactory
 from student.models import CourseEnrollment
-from xmodule.block_metadata_utils import display_name_with_default_escaped
 from xmodule.graders import ProblemScore
 from xmodule.modulestore import ModuleStoreEnum
 from xmodule.modulestore.tests.factories import CourseFactory, ItemFactory
 from xmodule.modulestore.tests.django_utils import SharedModuleStoreTestCase
 
 from .utils import answer_problem
-from .. import course_grades
-from ..course_grades import summary as grades_summary
 from ..module_grades import get_module_score
 from ..new.course_grade import CourseGradeFactory
 from ..new.subsection_grade import SubsectionGradeFactory
 
 
-def _grade_with_errors(student, course):
-    """This fake grade method will throw exceptions for student3 and
-    student4, but allow any other students to go through normal grading.
-
-    It's meant to simulate when something goes really wrong while trying to
-    grade a particular student, so we can test that we won't kill the entire
-    course grading run.
-    """
-    if student.username in ['student3', 'student4']:
-        raise Exception("I don't like {}".format(student.username))
-
-    return grades_summary(student, course)
-
-
-def _create_problem_xml():
-    """
-    Creates and returns XML for a multiple choice response problem
-    """
-    return MultipleChoiceResponseXMLFactory().build_xml(
-        question_text='The correct answer is Choice 3',
-        choices=[False, False, True, False],
-        choice_names=['choice_0', 'choice_1', 'choice_2', 'choice_3']
-    )
-
-
 @attr(shard=1)
 class TestGradeIteration(SharedModuleStoreTestCase):
     """
-    Test iteration through student gradesets.
+    Test iteration through student course grades.
     """
     COURSE_NUM = "1000"
     COURSE_NAME = "grading_test_course"
@@ -87,29 +57,25 @@ class TestGradeIteration(SharedModuleStoreTestCase):
         ]
 
     def test_empty_student_list(self):
-        """If we don't pass in any students, it should return a zero-length
-        iterator, but it shouldn't error."""
-        gradeset_results = list(course_grades.iterate_grades_for(self.course.id, []))
-        self.assertEqual(gradeset_results, [])
-
-    def test_nonexistent_course(self):
-        """If the course we want to get grades for does not exist, a `Http404`
-        should be raised. This is a horrible crossing of abstraction boundaries
-        and should be fixed, but for now we're just testing the behavior. :-("""
-        with self.assertRaises(Http404):
-            gradeset_results = course_grades.iterate_grades_for(SlashSeparatedCourseKey("I", "dont", "exist"), [])
-            gradeset_results.next()
+        """
+        If we don't pass in any students, it should return a zero-length
+        iterator, but it shouldn't error.
+        """
+        grade_results = list(CourseGradeFactory().iter(self.course, []))
+        self.assertEqual(grade_results, [])
 
     def test_all_empty_grades(self):
-        """No students have grade entries"""
-        all_gradesets, all_errors = self._gradesets_and_errors_for(self.course.id, self.students)
+        """
+        No students have grade entries.
+        """
+        all_course_grades, all_errors = self._course_grades_and_errors_for(self.course, self.students)
         self.assertEqual(len(all_errors), 0)
-        for gradeset in all_gradesets.values():
-            self.assertIsNone(gradeset['grade'])
-            self.assertEqual(gradeset['percent'], 0.0)
+        for course_grade in all_course_grades.values():
+            self.assertIsNone(course_grade.letter_grade)
+            self.assertEqual(course_grade.percent, 0.0)
 
-    @patch('lms.djangoapps.grades.course_grades.summary', _grade_with_errors)
-    def test_grading_exception(self):
+    @patch('lms.djangoapps.grades.new.course_grade.CourseGradeFactory.create')
+    def test_grading_exception(self, mock_course_grade):
         """Test that we correctly capture exception messages that bubble up from
         grading. Note that we only see errors at this level if the grading
         process for this student fails entirely due to an unexpected event --
@@ -118,43 +84,51 @@ class TestGradeIteration(SharedModuleStoreTestCase):
         We patch the grade() method with our own, which will generate the errors
         for student3 and student4.
         """
-        all_gradesets, all_errors = self._gradesets_and_errors_for(self.course.id, self.students)
+
         student1, student2, student3, student4, student5 = self.students
+        mock_course_grade.side_effect = [
+            Exception("Error for {}.".format(student.username))
+            if student.username in ['student3', 'student4']
+            else mock_course_grade.return_value
+            for student in self.students
+        ]
+        all_course_grades, all_errors = self._course_grades_and_errors_for(self.course, self.students)
         self.assertEqual(
             all_errors,
             {
-                student3: "I don't like student3",
-                student4: "I don't like student4"
+                student3: "Error for student3.",
+                student4: "Error for student4.",
             }
         )
 
         # But we should still have five gradesets
-        self.assertEqual(len(all_gradesets), 5)
+        self.assertEqual(len(all_course_grades), 5)
 
         # Even though two will simply be empty
-        self.assertFalse(all_gradesets[student3])
-        self.assertFalse(all_gradesets[student4])
+        self.assertIsNone(all_course_grades[student3])
+        self.assertIsNone(all_course_grades[student4])
 
         # The rest will have grade information in them
-        self.assertTrue(all_gradesets[student1])
-        self.assertTrue(all_gradesets[student2])
-        self.assertTrue(all_gradesets[student5])
+        self.assertIsNotNone(all_course_grades[student1])
+        self.assertIsNotNone(all_course_grades[student2])
+        self.assertIsNotNone(all_course_grades[student5])
 
-    ################################# Helpers #################################
-    def _gradesets_and_errors_for(self, course_id, students):
-        """Simple helper method to iterate through student grades and give us
+    def _course_grades_and_errors_for(self, course, students):
+        """
+        Simple helper method to iterate through student grades and give us
         two dictionaries -- one that has all students and their respective
-        gradesets, and one that has only students that could not be graded and
-        their respective error messages."""
-        students_to_gradesets = {}
+        course grades, and one that has only students that could not be graded
+        and their respective error messages.
+        """
+        students_to_course_grades = {}
         students_to_errors = {}
 
-        for student, gradeset, err_msg in course_grades.iterate_grades_for(course_id, students):
-            students_to_gradesets[student] = gradeset
+        for student, course_grade, err_msg in CourseGradeFactory().iter(course, students):
+            students_to_course_grades[student] = course_grade
             if err_msg:
                 students_to_errors[student] = err_msg
 
-        return students_to_gradesets, students_to_errors
+        return students_to_course_grades, students_to_errors
 
 
 @ddt.ddt
@@ -169,7 +143,7 @@ class TestWeightedProblems(SharedModuleStoreTestCase):
         cls.chapter = ItemFactory.create(parent=cls.course, category="chapter", display_name="chapter")
         cls.sequential = ItemFactory.create(parent=cls.chapter, category="sequential", display_name="sequential")
         cls.vertical = ItemFactory.create(parent=cls.sequential, category="vertical", display_name="vertical1")
-        problem_xml = _create_problem_xml()
+        problem_xml = cls._create_problem_xml()
         cls.problems = []
         for i in range(2):
             cls.problems.append(
@@ -186,6 +160,17 @@ class TestWeightedProblems(SharedModuleStoreTestCase):
         self.user = UserFactory()
         self.request = get_mock_request(self.user)
 
+    @classmethod
+    def _create_problem_xml(cls):
+        """
+        Creates and returns XML for a multiple choice response problem
+        """
+        return MultipleChoiceResponseXMLFactory().build_xml(
+            question_text='The correct answer is Choice 3',
+            choices=[False, False, True, False],
+            choice_names=['choice_0', 'choice_1', 'choice_2', 'choice_3']
+        )
+
     def _verify_grades(self, raw_earned, raw_possible, weight, expected_score):
         """
         Verifies the computed grades are as expected.
@@ -211,8 +196,6 @@ class TestWeightedProblems(SharedModuleStoreTestCase):
         # verify all problem grades
         for problem in self.problems:
             problem_score = subsection_grade.locations_to_scores[problem.location]
-            expected_score.display_name = display_name_with_default_escaped(problem)
-            expected_score.module_id = problem.location
             self.assertEquals(problem_score, expected_score)
 
         # verify subsection grades
@@ -246,8 +229,6 @@ class TestWeightedProblems(SharedModuleStoreTestCase):
             weighted_possible=expected_w_possible,
             weight=weight,
             graded=expected_graded,
-            display_name=None,  # problem-specific, filled in by _verify_grades
-            module_id=None,  # problem-specific, filled in by _verify_grades
             attempted=True,
         )
         self._verify_grades(raw_earned, raw_possible, weight, expected_score)
@@ -296,7 +277,7 @@ class TestScoreForModule(SharedModuleStoreTestCase):
         answer_problem(cls.course, cls.request, cls.l, score=1, max_value=3)
         answer_problem(cls.course, cls.request, cls.n, score=3, max_value=10)
 
-        cls.course_grade = CourseGradeFactory(cls.request.user).create(cls.course)
+        cls.course_grade = CourseGradeFactory().create(cls.request.user, cls.course)
 
     def test_score_chapter(self):
         earned, possible = self.course_grade.score_for_module(self.a.location)
diff --git a/lms/djangoapps/grades/tests/test_new.py b/lms/djangoapps/grades/tests/test_new.py
index e5584059ab..fcdfaccaa5 100644
--- a/lms/djangoapps/grades/tests/test_new.py
+++ b/lms/djangoapps/grades/tests/test_new.py
@@ -111,7 +111,7 @@ class TestCourseGradeFactory(GradeTestBase):
     def test_course_grade_feature_gating(self, feature_flag, course_setting):
         # Grades are only saved if the feature flag and the advanced setting are
         # both set to True.
-        grade_factory = CourseGradeFactory(self.request.user)
+        grade_factory = CourseGradeFactory()
         with persistent_grades_feature_flags(
             global_flag=feature_flag,
             enabled_for_all_courses=False,
@@ -119,32 +119,32 @@ class TestCourseGradeFactory(GradeTestBase):
             enabled_for_course=course_setting
         ):
             with patch('lms.djangoapps.grades.new.course_grade.CourseGrade.load_persisted_grade') as mock_save_grades:
-                grade_factory.create(self.course)
+                grade_factory.create(self.request.user, self.course)
         self.assertEqual(mock_save_grades.called, feature_flag and course_setting)
 
     def test_course_grade_creation(self):
-        grade_factory = CourseGradeFactory(self.request.user)
+        grade_factory = CourseGradeFactory()
         with mock_get_score(1, 2):
-            course_grade = grade_factory.create(self.course)
+            course_grade = grade_factory.create(self.request.user, self.course)
         self.assertEqual(course_grade.letter_grade, u'Pass')
         self.assertEqual(course_grade.percent, 0.5)
 
     def test_zero_course_grade(self):
-        grade_factory = CourseGradeFactory(self.request.user)
+        grade_factory = CourseGradeFactory()
         with mock_get_score(0, 2):
-            course_grade = grade_factory.create(self.course)
+            course_grade = grade_factory.create(self.request.user, self.course)
         self.assertIsNone(course_grade.letter_grade)
         self.assertEqual(course_grade.percent, 0.0)
 
     def test_get_persisted(self):
-        grade_factory = CourseGradeFactory(self.request.user)
+        grade_factory = CourseGradeFactory()
         # first, create a grade in the database
         with mock_get_score(1, 2):
-            grade_factory.create(self.course, read_only=False)
+            grade_factory.create(self.request.user, self.course, read_only=False)
 
         # retrieve the grade, ensuring it is as expected and take just one query
         with self.assertNumQueries(1):
-            course_grade = grade_factory.get_persisted(self.course)
+            course_grade = grade_factory.get_persisted(self.request.user, self.course)
         self.assertEqual(course_grade.letter_grade, u'Pass')
         self.assertEqual(course_grade.percent, 0.5)
 
@@ -168,7 +168,7 @@ class TestCourseGradeFactory(GradeTestBase):
         # ensure the grade can still be retrieved via get_persisted
         # despite its outdated grading policy
         with self.assertNumQueries(1):
-            course_grade = grade_factory.get_persisted(self.course)
+            course_grade = grade_factory.get_persisted(self.request.user, self.course)
         self.assertEqual(course_grade.letter_grade, u'Pass')
         self.assertEqual(course_grade.percent, 0.5)
 
@@ -587,7 +587,7 @@ class TestCourseGradeLogging(ProblemSubmissionTestMixin, SharedModuleStoreTestCa
         Creates a course grade and asserts that the associated logging
         matches the expected totals passed in to the function.
         """
-        factory.create(self.course, read_only=False)
+        factory.create(self.request.user, self.course, read_only=False)
         log_mock.assert_called_with(
             u"Persistent Grades: CourseGrade.{0}, course: {1}, user: {2}".format(
                 log_statement,
@@ -597,7 +597,7 @@ class TestCourseGradeLogging(ProblemSubmissionTestMixin, SharedModuleStoreTestCa
         )
 
     def test_course_grade_logging(self):
-        grade_factory = CourseGradeFactory(self.request.user)
+        grade_factory = CourseGradeFactory()
         with persistent_grades_feature_flags(
             global_flag=True,
             enabled_for_all_courses=False,
diff --git a/lms/djangoapps/grades/tests/test_scores.py b/lms/djangoapps/grades/tests/test_scores.py
index 18b10e18b3..aeefd4e279 100644
--- a/lms/djangoapps/grades/tests/test_scores.py
+++ b/lms/djangoapps/grades/tests/test_scores.py
@@ -175,9 +175,7 @@ class TestGetScore(TestCase):
             self._create_persisted_block(persisted_block_value),
             self._create_block(block_value),
         )
-        expected_score = ProblemScore(
-            display_name=self.display_name, module_id=self.location, **expected_result._asdict()
-        )
+        expected_score = ProblemScore(**expected_result._asdict())
         self.assertEquals(score, expected_score)
 
 
diff --git a/lms/djangoapps/grades/tests/utils.py b/lms/djangoapps/grades/tests/utils.py
index 33845ec267..7369ac59c7 100644
--- a/lms/djangoapps/grades/tests/utils.py
+++ b/lms/djangoapps/grades/tests/utils.py
@@ -9,13 +9,15 @@ from xmodule.graders import ProblemScore
 
 
 @contextmanager
-def mock_passing_grade(grade_pass='Pass', percent=0.75):
+def mock_passing_grade(grade_pass='Pass', percent=0.75, ):
     """
     Mock the grading function to always return a passing grade.
     """
-    with patch('lms.djangoapps.grades.course_grades.summary') as mock_grade:
-        mock_grade.return_value = {'grade': grade_pass, 'percent': percent}
-        yield
+    with patch('lms.djangoapps.grades.new.course_grade.CourseGrade._compute_letter_grade') as mock_letter_grade:
+        with patch('lms.djangoapps.grades.new.course_grade.CourseGrade._calc_percent') as mock_percent_grade:
+            mock_letter_grade.return_value = grade_pass
+            mock_percent_grade.return_value = percent
+            yield
 
 
 @contextmanager
@@ -31,8 +33,6 @@ def mock_get_score(earned=0, possible=1):
             weighted_possible=possible,
             weight=1,
             graded=True,
-            display_name=None,
-            module_id=None,
             attempted=True,
         )
         yield mock_score
diff --git a/lms/djangoapps/instructor/views/gradebook_api.py b/lms/djangoapps/instructor/views/gradebook_api.py
index a7fd7474b3..8cc8d82c7c 100644
--- a/lms/djangoapps/instructor/views/gradebook_api.py
+++ b/lms/djangoapps/instructor/views/gradebook_api.py
@@ -14,7 +14,7 @@ from opaque_keys.edx.keys import CourseKey
 from edxmako.shortcuts import render_to_response
 from courseware.courses import get_course_with_access
 from lms.djangoapps.instructor.views.api import require_level
-from lms.djangoapps.grades import course_grades
+from lms.djangoapps.grades.new.course_grade import CourseGradeFactory
 from xmodule.modulestore.django import modulestore
 
 
@@ -91,7 +91,7 @@ def get_grade_book_page(request, course, course_key):
                 'username': student.username,
                 'id': student.id,
                 'email': student.email,
-                'grade_summary': course_grades.summary(student, course)
+                'grade_summary': CourseGradeFactory().create(student, course).summary
             }
             for student in enrolled_students
         ]
diff --git a/lms/djangoapps/instructor_analytics/basic.py b/lms/djangoapps/instructor_analytics/basic.py
index 23febe2e05..4543fed179 100644
--- a/lms/djangoapps/instructor_analytics/basic.py
+++ b/lms/djangoapps/instructor_analytics/basic.py
@@ -491,14 +491,14 @@ def dump_grading_context(course):
     msg += hbar
     msg += "Listing grading context for course %s\n" % course.id.to_deprecated_string()
 
-    gcontext = grading_context_for_course(course)
+    gcontext = grading_context_for_course(course.id)
     msg += "graded sections:\n"
 
-    msg += '%s\n' % gcontext['all_graded_sections'].keys()
-    for (gsomething, gsvals) in gcontext['all_graded_sections'].items():
+    msg += '%s\n' % gcontext['all_graded_subsections_by_type'].keys()
+    for (gsomething, gsvals) in gcontext['all_graded_subsections_by_type'].items():
         msg += "--> Section %s:\n" % (gsomething)
         for sec in gsvals:
-            sdesc = sec['section_block']
+            sdesc = sec['subsection_block']
             frmat = getattr(sdesc, 'format', None)
             aname = ''
             if frmat in graders:
diff --git a/lms/djangoapps/instructor_task/tests/test_integration.py b/lms/djangoapps/instructor_task/tests/test_integration.py
index e22c3ba4cd..e64a23abc7 100644
--- a/lms/djangoapps/instructor_task/tests/test_integration.py
+++ b/lms/djangoapps/instructor_task/tests/test_integration.py
@@ -134,9 +134,9 @@ class TestRescoringTask(TestIntegrationTask):
         # are in sync.
         expected_subsection_grade = expected_score
 
-        course_grade = CourseGradeFactory(user).create(self.course)
+        course_grade = CourseGradeFactory().create(user, self.course)
         self.assertEquals(
-            course_grade.subsection_grade_totals_by_format['Homework'][0].earned,
+            course_grade.graded_subsections_by_format['Homework'][0].graded_total.earned,
             expected_subsection_grade,
         )
 
diff --git a/lms/djangoapps/lti_provider/tasks.py b/lms/djangoapps/lti_provider/tasks.py
index 396e462d2b..038951cda5 100644
--- a/lms/djangoapps/lti_provider/tasks.py
+++ b/lms/djangoapps/lti_provider/tasks.py
@@ -7,7 +7,7 @@ from django.contrib.auth.models import User
 from django.dispatch import receiver
 import logging
 
-from lms.djangoapps.grades import progress
+from lms.djangoapps.grades.new.course_grade import CourseGradeFactory
 from lms.djangoapps.grades.signals.signals import PROBLEM_WEIGHTED_SCORE_CHANGED
 from lms import CELERY_APP
 from lti_provider.models import GradedAssignment
@@ -109,8 +109,8 @@ def send_composite_outcome(user_id, course_id, assignment_id, version):
     mapped_usage_key = assignment.usage_key.map_into_course(course_key)
     user = User.objects.get(id=user_id)
     course = modulestore().get_course(course_key, depth=0)
-    progress_summary = progress.summary(user, course)
-    earned, possible = progress_summary.score_for_module(mapped_usage_key)
+    course_grade = CourseGradeFactory().create(user, course)
+    earned, possible = course_grade.score_for_module(mapped_usage_key)
     if possible == 0:
         weighted_score = 0
     else:
diff --git a/lms/djangoapps/lti_provider/tests/test_tasks.py b/lms/djangoapps/lti_provider/tests/test_tasks.py
index fe0d93ad7b..193a6dac70 100644
--- a/lms/djangoapps/lti_provider/tests/test_tasks.py
+++ b/lms/djangoapps/lti_provider/tests/test_tasks.py
@@ -99,9 +99,9 @@ class SendCompositeOutcomeTest(BaseOutcomeTest):
             block_type='problem',
             block_id='problem',
         )
-        self.weighted_scores = MagicMock()
-        self.weighted_scores_mock = self.setup_patch(
-            'lti_provider.tasks.progress.summary', self.weighted_scores
+        self.course_grade = MagicMock()
+        self.course_grade_mock = self.setup_patch(
+            'lti_provider.tasks.CourseGradeFactory.create', self.course_grade
         )
         self.module_store = MagicMock()
         self.module_store.get_item = MagicMock(return_value=self.descriptor)
@@ -117,7 +117,7 @@ class SendCompositeOutcomeTest(BaseOutcomeTest):
     )
     @ddt.unpack
     def test_outcome_with_score_score(self, earned, possible, expected):
-        self.weighted_scores.score_for_module = MagicMock(return_value=(earned, possible))
+        self.course_grade.score_for_module = MagicMock(return_value=(earned, possible))
         tasks.send_composite_outcome(
             self.user.id, unicode(self.course_key), self.assignment.id, 1
         )
@@ -129,4 +129,4 @@ class SendCompositeOutcomeTest(BaseOutcomeTest):
         tasks.send_composite_outcome(
             self.user.id, unicode(self.course_key), self.assignment.id, 1
         )
-        self.assertEqual(self.weighted_scores_mock.call_count, 0)
+        self.assertEqual(self.course_grade_mock.call_count, 0)
diff --git a/openedx/core/djangoapps/credit/signals.py b/openedx/core/djangoapps/credit/signals.py
index a239589600..c154adc05e 100644
--- a/openedx/core/djangoapps/credit/signals.py
+++ b/openedx/core/djangoapps/credit/signals.py
@@ -10,7 +10,7 @@ from opaque_keys.edx.keys import CourseKey
 from xmodule.modulestore.django import SignalHandler
 
 from openedx.core.djangoapps.credit.verification_access import update_verification_partitions
-from openedx.core.djangoapps.signals.signals import GRADES_UPDATED
+from openedx.core.djangoapps.signals.signals import COURSE_GRADE_CHANGED
 
 log = logging.getLogger(__name__)
 
@@ -52,14 +52,14 @@ def on_pre_publish(sender, course_key, **kwargs):  # pylint: disable=unused-argu
         log.info(u"Finished updating in-course reverification access rules")
 
 
-@receiver(GRADES_UPDATED)
-def listen_for_grade_calculation(sender, user, grade_summary, course_key, deadline, **kwargs):  # pylint: disable=unused-argument
+@receiver(COURSE_GRADE_CHANGED)
+def listen_for_grade_calculation(sender, user, course_grade, course_key, deadline, **kwargs):  # pylint: disable=unused-argument
     """Receive 'MIN_GRADE_REQUIREMENT_STATUS' signal and update minimum grade requirement status.
 
     Args:
         sender: None
         user(User): User Model object
-        grade_summary(dict): Dict containing output from the course grader
+        course_grade(CourseGrade): CourseGrade object
         course_key(CourseKey): The key for the course
         deadline(datetime): Course end date or None
 
@@ -78,7 +78,7 @@ def listen_for_grade_calculation(sender, user, grade_summary, course_key, deadli
             criteria = requirements[0].get('criteria')
             if criteria:
                 min_grade = criteria.get('min_grade')
-                passing_grade = grade_summary['percent'] >= min_grade
+                passing_grade = course_grade.percent >= min_grade
                 now = timezone.now()
                 status = None
                 reason = None
@@ -89,7 +89,7 @@ def listen_for_grade_calculation(sender, user, grade_summary, course_key, deadli
                     if passing_grade:
                         # Student received a passing grade
                         status = 'satisfied'
-                        reason = {'final_grade': grade_summary['percent']}
+                        reason = {'final_grade': course_grade.percent}
                 else:
                     # Submission after deadline
 
@@ -104,7 +104,7 @@ def listen_for_grade_calculation(sender, user, grade_summary, course_key, deadli
                         # Student failed to receive minimum grade
                         status = 'failed'
                         reason = {
-                            'final_grade': grade_summary['percent'],
+                            'final_grade': course_grade.percent,
                             'minimum_grade': min_grade
                         }
 
diff --git a/openedx/core/djangoapps/credit/tests/test_signals.py b/openedx/core/djangoapps/credit/tests/test_signals.py
index f3d55529a2..a3abe179b9 100644
--- a/openedx/core/djangoapps/credit/tests/test_signals.py
+++ b/openedx/core/djangoapps/credit/tests/test_signals.py
@@ -5,6 +5,7 @@ Tests for minimum grade requirement status
 import ddt
 import pytz
 from datetime import timedelta, datetime
+from mock import MagicMock
 from unittest import skipUnless
 
 from django.conf import settings
@@ -73,7 +74,9 @@ class TestMinGradedRequirementStatus(ModuleStoreTestCase):
 
     def assert_requirement_status(self, grade, due_date, expected_status):
         """ Verify the user's credit requirement status is as expected after simulating a grading calculation. """
-        listen_for_grade_calculation(None, self.user, {'percent': grade}, self.course.id, due_date)
+        course_grade = MagicMock()
+        course_grade.percent = grade
+        listen_for_grade_calculation(None, self.user, course_grade, self.course.id, due_date)
         req_status = get_credit_requirement_status(self.course.id, self.request.user.username, 'grade', 'grade')
 
         self.assertEqual(req_status[0]['status'], expected_status)
diff --git a/openedx/core/djangoapps/signals/signals.py b/openedx/core/djangoapps/signals/signals.py
index cfbf23969b..b232e70fb8 100644
--- a/openedx/core/djangoapps/signals/signals.py
+++ b/openedx/core/djangoapps/signals/signals.py
@@ -5,8 +5,8 @@ This module contains all signals.
 from django.dispatch import Signal
 
 
-# Signal that fires when a user is graded (in lms/grades/course_grades.py)
-GRADES_UPDATED = Signal(providing_args=["user", "grade_summary", "course_key", "deadline"])
+# Signal that fires when a user is graded
+COURSE_GRADE_CHANGED = Signal(providing_args=["user", "course_grade", "course_key", "deadline"])
 
 # Signal that fires when a user is awarded a certificate in a course (in the certificates django app)
 # TODO: runtime coupling between apps will be reduced if this event is changed to carry a username