Index: lams_learning/src/java/org/lamsfoundation/lams/learning/service/LearnerService.java
===================================================================
diff -u -rbd4fa408454e7389b4e60bc68f2488de88eff663 -r9825c35880ec88587666a5cf32a6fad2de9b3bab
--- lams_learning/src/java/org/lamsfoundation/lams/learning/service/LearnerService.java	(.../LearnerService.java)	(revision bd4fa408454e7389b4e60bc68f2488de88eff663)
+++ lams_learning/src/java/org/lamsfoundation/lams/learning/service/LearnerService.java	(.../LearnerService.java)	(revision 9825c35880ec88587666a5cf32a6fad2de9b3bab)
@@ -404,10 +404,6 @@
 	return builder.getActivityList();
     }
 
-    /**
-     * @see org.lamsfoundation.lams.learning.service.ICoreLearnerService#chooseActivity(org.lamsfoundation.lams.usermanagement.User,
-     *      java.lang.Long, org.lamsfoundation.lams.learningdesign.Activity)
-     */
     @Override
     public LearnerProgress chooseActivity(Integer learnerId, Long lessonId, Activity activity,
 	    Boolean clearCompletedFlag) {
Index: lams_learning/src/java/org/lamsfoundation/lams/learning/web/controller/DisplayOptionsActivityController.java
===================================================================
diff -u -rbe74862925361d836bef1df4c5959105c9695a87 -r9825c35880ec88587666a5cf32a6fad2de9b3bab
--- lams_learning/src/java/org/lamsfoundation/lams/learning/web/controller/DisplayOptionsActivityController.java	(.../DisplayOptionsActivityController.java)	(revision be74862925361d836bef1df4c5959105c9695a87)
+++ lams_learning/src/java/org/lamsfoundation/lams/learning/web/controller/DisplayOptionsActivityController.java	(.../DisplayOptionsActivityController.java)	(revision 9825c35880ec88587666a5cf32a6fad2de9b3bab)
@@ -38,6 +38,7 @@
 import org.lamsfoundation.lams.learning.web.util.LearningWebUtil;
 import org.lamsfoundation.lams.learningdesign.Activity;
 import org.lamsfoundation.lams.learningdesign.OptionsActivity;
+import org.lamsfoundation.lams.learningdesign.SequenceActivity;
 import org.lamsfoundation.lams.learningdesign.dto.ActivityPositionDTO;
 import org.lamsfoundation.lams.learningdesign.dto.ActivityURL;
 import org.lamsfoundation.lams.lesson.LearnerProgress;
@@ -85,13 +86,29 @@
 	form.setActivityID(activity.getActivityId());
 
 	List<ActivityURL> activityURLs = new ArrayList<>();
-	Set<Activity> subActivities = optionsActivity.getActivities();
-	Iterator<Activity> i = subActivities.iterator();
+	Set<Activity> optionsChildActivities = optionsActivity.getActivities();
+	Iterator<Activity> i = optionsChildActivities.iterator();
 	int completedCount = 0;
 	while (i.hasNext()) {
-	    ActivityURL activityURL = activityMapping.getActivityURL(learnerProgress, i.next(), false, false);
+	    Activity optionsChildActivity = i.next();
+	    ActivityURL activityURL = activityMapping.getActivityURL(learnerProgress, optionsChildActivity, false, false);
+
 	    if (activityURL.isComplete()) {
 		completedCount++;
+
+		//create list of activityURLs of all children activities
+		if (optionsChildActivity instanceof SequenceActivity) {
+		    activityURL.setUrl(null);
+		    
+		    List<ActivityURL> childActivities = new ArrayList<>();
+		    Set<Activity> sequenceChildActivities = ((SequenceActivity) optionsChildActivity).getActivities();
+		    for (Activity sequenceChildActivity : sequenceChildActivities) {
+			ActivityURL sequenceActivityURL = activityMapping.getActivityURL(learnerProgress,
+				sequenceChildActivity, false, false);
+			childActivities.add(sequenceActivityURL);
+		    }
+		    activityURL.setChildActivities(childActivities);
+		}
 	    }
 	    activityURLs.add(activityURL);
 	}
Index: lams_learning/src/java/org/lamsfoundation/lams/learning/web/controller/SequenceActivityController.java
===================================================================
diff -u -rbe74862925361d836bef1df4c5959105c9695a87 -r9825c35880ec88587666a5cf32a6fad2de9b3bab
--- lams_learning/src/java/org/lamsfoundation/lams/learning/web/controller/SequenceActivityController.java	(.../SequenceActivityController.java)	(revision be74862925361d836bef1df4c5959105c9695a87)
+++ lams_learning/src/java/org/lamsfoundation/lams/learning/web/controller/SequenceActivityController.java	(.../SequenceActivityController.java)	(revision 9825c35880ec88587666a5cf32a6fad2de9b3bab)
@@ -34,7 +34,6 @@
 import org.lamsfoundation.lams.learning.web.util.ActivityMapping;
 import org.lamsfoundation.lams.learning.web.util.LearningWebUtil;
 import org.lamsfoundation.lams.learningdesign.Activity;
-import org.lamsfoundation.lams.learningdesign.NullActivity;
 import org.lamsfoundation.lams.learningdesign.SequenceActivity;
 import org.lamsfoundation.lams.lesson.LearnerProgress;
 import org.lamsfoundation.lams.util.WebUtil;
@@ -79,13 +78,21 @@
 	}
 
 	SequenceActivity sequenceActivity = (SequenceActivity) activity;
-	Activity firstActivityInSequence = sequenceActivity.getNextActivityByParent(new NullActivity());
 
-	if ((firstActivityInSequence != null) && !firstActivityInSequence.isNull()) {
-	    // Set the first activity as the current activity and display it
+	Activity firstIncompletedActivity = null;
+	// getActivities is ordered by order id
+	for (Activity activityIter : sequenceActivity.getActivities()) {
+	    if (!learnerProgress.getCompletedActivities().containsKey(activityIter)) {
+		firstIncompletedActivity = activityIter;
+		break;
+	    }
+	}
+
+	if (firstIncompletedActivity != null) {
+	    // Set the first incompleted activity as the current activity and display it
 	    learnerProgress = learnerService.chooseActivity(learnerId, learnerProgress.getLesson().getLessonId(),
-		    firstActivityInSequence, true);
-	    return activityMapping.getActivityForward(firstActivityInSequence, learnerProgress, true);
+		    firstIncompletedActivity, true);
+	    return activityMapping.getActivityForward(firstIncompletedActivity, learnerProgress, true);
 
 	} else {
 	    // No activities exist in the sequence, so go to the next activity.