diff --git a/djangoapps/courseware/capa/capa_problem.py b/djangoapps/courseware/capa/capa_problem.py
index 05509acc35..4bd97776d4 100644
--- a/djangoapps/courseware/capa/capa_problem.py
+++ b/djangoapps/courseware/capa/capa_problem.py
@@ -15,7 +15,7 @@ from mako.template import Template
 
 from util import contextualize_text
 import inputtypes
-from responsetypes import NumericalResponse, FormulaResponse, CustomResponse, SchematicResponse, MultipleChoiceResponse,  StudentInputError
+from responsetypes import NumericalResponse, FormulaResponse, CustomResponse, SchematicResponse, MultipleChoiceResponse,  StudentInputError, TrueFalseResponse
 
 import calc
 import eia
@@ -26,7 +26,8 @@ response_types = {'numericalresponse':NumericalResponse,
                   'formularesponse':FormulaResponse,
                   'customresponse':CustomResponse,
                   'schematicresponse':SchematicResponse,
-                  'multiplechoiceresponse':MultipleChoiceResponse}
+                  'multiplechoiceresponse':MultipleChoiceResponse,
+                  'truefalseresponse':TrueFalseResponse}
 entry_types = ['textline', 'schematic', 'choicegroup']
 response_properties = ["responseparam", "answer"]
 # How to convert from original XML to HTML
@@ -92,6 +93,10 @@ class LoncapaProblem(object):
 
         self.preprocess_problem(self.tree, correct_map=self.correct_map, answer_map = self.student_answers)
         self.context = self.extract_context(self.tree, seed=self.seed)
+        for response in self.tree.xpath('//'+"|//".join(response_types)):
+            responder = response_types[response.tag](response, self.context)
+            responder.preprocess_response()
+
 
     def get_state(self):
         ''' Stored per-user session data neeeded to: 
@@ -129,7 +134,6 @@ class LoncapaProblem(object):
             grader = response_types[response.tag](response, self.context)
             results = grader.grade(answers)
             self.correct_map.update(results)
-
         return self.correct_map
 
     def get_question_answers(self):
@@ -181,7 +185,7 @@ class LoncapaProblem(object):
         tree=Element(problemtree.tag)
         for item in problemtree:
             subitems = self.extract_html(item)
-            if subitems: 
+            if len(subitems): 
                 for subitem in subitems:
                     tree.append(subitem)
         for (key,value) in problemtree.items():
diff --git a/djangoapps/courseware/capa/inputtypes.py b/djangoapps/courseware/capa/inputtypes.py
index 8002932b66..460ff7a5eb 100644
--- a/djangoapps/courseware/capa/inputtypes.py
+++ b/djangoapps/courseware/capa/inputtypes.py
@@ -7,7 +7,12 @@ from mitxmako.shortcuts import render_to_string
 
 def choicegroup(element, value, state):
     eid=element.get('id')
-    type="radio" #because right now, we are only doing multiple choice
+    if element.get('type') == "MultipleChoice":
+        type="radio"
+    elif element.get('type') == "TrueFalse":
+        type="checkbox"
+    else:
+        type="radio"
     choices={}
     for choice in element:
         assert choice.tag =="choice", "only <choice> tags should be immediate children of a <choicegroup>"
diff --git a/djangoapps/courseware/capa/responsetypes.py b/djangoapps/courseware/capa/responsetypes.py
index 153bcd16d6..9fde05d8d9 100644
--- a/djangoapps/courseware/capa/responsetypes.py
+++ b/djangoapps/courseware/capa/responsetypes.py
@@ -5,6 +5,7 @@ import numpy
 import random
 import scipy
 import traceback
+import copy
 
 from calc import evaluator, UndefinedVariable
 from django.conf import settings
@@ -36,9 +37,17 @@ def compare_with_tolerance(v1, v2, tol):
         tolerance = evaluator(dict(),dict(),tol)
     return abs(v1-v2) <= tolerance
 
+class GenericResponse(object):
+    def grade(self, student_answers):
+        pass
+    def get_answers(self):
+        pass
+    def preprocess_response(self):
+        pass
+
 #Every response type needs methods "grade" and "get_answers"     
 
-class MultipleChoiceResponse(object):
+class MultipleChoiceResponse(GenericResponse):
     def __init__(self, xml, context):
         self.xml = xml
         self.correct_choices = xml.xpath('//*[@id=$id]//choice[@correct="true"]',
@@ -52,8 +61,6 @@ class MultipleChoiceResponse(object):
         self.answer_id=self.answer_id[0]
 
     def grade(self, student_answers):
-        answers={}
-
         if self.answer_id in student_answers and student_answers[self.answer_id] in self.correct_choices:
             return {self.answer_id:'correct'}
         else:
@@ -61,8 +68,32 @@ class MultipleChoiceResponse(object):
 
     def get_answers(self):
         return {self.answer_id:self.correct_choices}
-    
-class NumericalResponse(object):
+
+    def preprocess_response(self):
+        for response in self.xml.xpath("choicegroup"):
+            response.set("type", "MultipleChoice")
+
+class TrueFalseResponse(MultipleChoiceResponse):
+    def preprocess_response(self):
+        for response in self.xml.xpath("choicegroup"):
+            response.set("type", "TrueFalse")
+
+    def grade(self, student_answers):
+        correct = copy.deepcopy(self.correct_choices)
+        if self.answer_id in student_answers and student_answers[self.answer_id]:
+            for answer in student_answers[self.answer_id]:
+                if answer in correct:
+                    correct.remove(answer)
+                else:
+                    return {self.answer_id:'incorrect'}
+            if len(correct) != 0:
+                return {self.answer_id:'incorrect'}
+            else:
+                return{self.answer_id:'correct'}
+        else:
+            return {self.answer_id:'incorrect'}
+
+class NumericalResponse(GenericResponse):
     def __init__(self, xml, context):
         self.xml = xml
         self.correct_answer = contextualize_text(xml.get('answer'), context)
@@ -91,7 +122,7 @@ class NumericalResponse(object):
     def get_answers(self):
         return {self.answer_id:self.correct_answer}
 
-class CustomResponse(object):
+class CustomResponse(GenericResponse):
     def __init__(self, xml, context):
         self.xml = xml
         ## CRITICAL TODO: Should cover all entrytypes
@@ -122,7 +153,7 @@ class CustomResponse(object):
 class StudentInputError(Exception):
     pass
 
-class FormulaResponse(object):
+class FormulaResponse(GenericResponse):
     def __init__(self, xml, context):
         self.xml = xml
         self.correct_answer = contextualize_text(xml.get('answer'), context)
@@ -192,7 +223,7 @@ class FormulaResponse(object):
     def get_answers(self):
         return {self.answer_id:self.correct_answer}
 
-class SchematicResponse(object):
+class SchematicResponse(GenericResponse):
     def __init__(self, xml, context):
         self.xml = xml
         self.answer_ids = xml.xpath('//*[@id=$id]//schematic/@id',
diff --git a/djangoapps/courseware/module_render.py b/djangoapps/courseware/module_render.py
index 38f9e0211b..273c0ff19a 100644
--- a/djangoapps/courseware/module_render.py
+++ b/djangoapps/courseware/module_render.py
@@ -83,7 +83,10 @@ def modx_dispatch(request, module=None, dispatch=None, id=None):
                                                          track_function = make_track_function(request), 
                                                          render_function = None)
     # Let the module handle the AJAX
-    ajax_return=instance.handle_ajax(dispatch, request.POST)
+    post_data=""
+    if request.raw_post_data:
+        post_data = json.loads(request.raw_post_data)
+    ajax_return=instance.handle_ajax(dispatch, post_data)
     # Save the state back to the database
     s.state=instance.get_state()
     if instance.get_score(): 
diff --git a/djangoapps/courseware/modules/capa_module.py b/djangoapps/courseware/modules/capa_module.py
index 86958dcf1c..d57e2d0786 100644
--- a/djangoapps/courseware/modules/capa_module.py
+++ b/djangoapps/courseware/modules/capa_module.py
@@ -270,8 +270,6 @@ class Module(XModule):
         for key in get:
             answers['_'.join(key.split('_')[1:])]=get[key]
 
-#        print "XXX", answers, get
-
         event_info['answers']=answers
 
         # Too late. Cannot submit
diff --git a/static/js/video_player.js b/static/js/video_player.js
index 5b3b9377a9..b03d0f42af 100644
--- a/static/js/video_player.js
+++ b/static/js/video_player.js
@@ -42,7 +42,7 @@ function postJSON(url, data, callback) {
     $.ajax({type:'POST',
 	    url: url,
 		dataType: 'json',
-		data: data,
+		data: JSON.stringify(data),
 		success: callback,
 		headers : {'X-CSRFToken':getCookie('csrftoken')}
   });
@@ -52,7 +52,7 @@ function postJSONAsync(url, data, callback) {
     $.ajax({type:'POST',
 	    url: url,
 		dataType: 'json',
-		data: data,
+		data: JSON.stringify(data),
 		success: callback,
 		headers : {'X-CSRFToken':getCookie('csrftoken')},
 		async:true
diff --git a/templates/choicegroup.html b/templates/choicegroup.html
index 5e281c330b..938ce5b535 100644
--- a/templates/choicegroup.html
+++ b/templates/choicegroup.html
@@ -2,7 +2,7 @@
   
   % for choice_id, choice_description in choices.items():
   <label for="input_${id}_${choice_id}">  <input type="${type}" name="input_${id}" id="input_${id}_${choice_id}" value="${choice_id}"
-  % if value == choice_id:
+  % if choice_id in value:
 	checked="true"
   % endif
   /> ${choice_description} </label>
diff --git a/templates/problem.js b/templates/problem.js
index 65b91c01fd..24b46bd2a1 100644
--- a/templates/problem.js
+++ b/templates/problem.js
@@ -8,12 +8,17 @@ function ${ id }_load() {
     $("input.schematic").each(function(index,element){ element.schematic.update_value(); });
     var submit_data={};
     $.each($("[id^=input_${ id }_]"), function(index,value){
-	    if (value.type==="radio" || value.type==="checkbox"){
+	    if (value.type==="checkbox"){
 		if (value.checked) {
 		    if (typeof submit_data[value.name] == 'undefined'){
-			submit_data[value.name]=[]
+			submit_data[value.name]=[];
 		    }
-		    submit_data[value.name]+=value.value;
+		    submit_data[value.name].push(value.value);
+		}
+	    }
+	    if (value.type==="radio"){
+		if (value.checked) {
+		    submit_data[value.name]= value.value;
 		}
 	    }
 	    else{
@@ -21,18 +26,18 @@ function ${ id }_load() {
 	    }
     });
     postJSON('/modx/problem/${ id }/problem_check',
-    submit_data,
-    function(json) {
-      switch(json.success) {
-      case 'incorrect': // Worked, but answer not 
-      case 'correct':
-	  ${ id }_load();
-      //alert("!!"+json.success);  
-          break;
-      default:
-        alert(json.success);  
-      }
-    });
+	     submit_data,
+	     function(json) {
+		 switch(json.success) {
+		 case 'incorrect': // Worked, but answer not 
+		 case 'correct':
+		     ${ id }_load();
+		     //alert("!!"+json.success);  
+		     break;
+		 default:
+		     alert(json.success);  
+		 }
+	     });
     log_event('problem_check', submit_data);
   });