Index: lams_common/src/java/org/lamsfoundation/lams/learningdesign/Activity.java
===================================================================
diff -u -rb78c6944c0df5f463456b89a6af82bb99369b214 -r6753e585772b555f5070050085fd1675a59242bc
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/Activity.java	(.../Activity.java)	(revision b78c6944c0df5f463456b89a6af82bb99369b214)
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/Activity.java	(.../Activity.java)	(revision 6753e585772b555f5070050085fd1675a59242bc)
@@ -556,15 +556,23 @@
 	    return new NullGroup();
 	}
 	/**
-	 * Check up whether a is tool activity or not.
-	 * @return
+	 * Check up whether an activity is tool activity or not.
+	 * @return is this activity a tool activity?
 	 */
 	public boolean isToolActivity()
 	{
 	    return getActivityTypeId().intValue()==TOOL_ACTIVITY_TYPE;
 	}
 	
 	/**
+	 * Check up whether an activity is sequence activity or not.
+	 * @return is this activity a sequence activity?
+	 */
+	public boolean isSequenceActivity()
+	{
+	    return getActivityTypeId().intValue()==SEQUENCE_ACTIVITY_TYPE;
+	}
+	/**
 	 * Delegate to activity strategy to check up the status of all children.
 	 * @param learnerProgress the current learner progress that record the
 	 * 						  all completed activities.
Index: lams_common/src/java/org/lamsfoundation/lams/learningdesign/SequenceActivity.java
===================================================================
diff -u -rfee6e64a584e9b1a7df005ba288332c49310fe7c -r6753e585772b555f5070050085fd1675a59242bc
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/SequenceActivity.java	(.../SequenceActivity.java)	(revision fee6e64a584e9b1a7df005ba288332c49310fe7c)
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/SequenceActivity.java	(.../SequenceActivity.java)	(revision 6753e585772b555f5070050085fd1675a59242bc)
@@ -117,6 +117,15 @@
     	return newSequenceActivity;
     }
 
+    /**
+     * Retrieve the first activity in current sequence activity;
+     * @return the first activity;
+     */
+    public Activity getFirstActivityInSequenceActivity()
+    {
+        return this.getNextActivityByParent(new NullActivity()); 
+    }
+    
     public String toString() {
         return new ToStringBuilder(this)
             .append("activityId", getActivityId())
Index: lams_common/src/java/org/lamsfoundation/lams/lesson/SequenceActivityStrategy.java
===================================================================
diff -u -r0cd6d5f3a368eb1fa3a140d87b5b1664ee4aa88d -r6753e585772b555f5070050085fd1675a59242bc
--- lams_common/src/java/org/lamsfoundation/lams/lesson/SequenceActivityStrategy.java	(.../SequenceActivityStrategy.java)	(revision 0cd6d5f3a368eb1fa3a140d87b5b1664ee4aa88d)
+++ lams_common/src/java/org/lamsfoundation/lams/lesson/SequenceActivityStrategy.java	(.../SequenceActivityStrategy.java)	(revision 6753e585772b555f5070050085fd1675a59242bc)
@@ -57,6 +57,9 @@
         for(Iterator i=children.iterator();i.hasNext();)
         {
             Activity curChild = (Activity)i.next();
+            //if no current child, we should return the first one.
+            if(currentChild.isNull())
+                return curChild;
             
             if(curChild.getActivityId().longValue()==currentChild.getActivityId().longValue())
                 return (Activity)i.next();
Index: lams_common/test/java/org/lamsfoundation/lams/lesson/TestActivityStrategy.java
===================================================================
diff -u -r600dc5c9c87aa8fc67e052124ac91385847c856c -r6753e585772b555f5070050085fd1675a59242bc
--- lams_common/test/java/org/lamsfoundation/lams/lesson/TestActivityStrategy.java	(.../TestActivityStrategy.java)	(revision 600dc5c9c87aa8fc67e052124ac91385847c856c)
+++ lams_common/test/java/org/lamsfoundation/lams/lesson/TestActivityStrategy.java	(.../TestActivityStrategy.java)	(revision 6753e585772b555f5070050085fd1675a59242bc)
@@ -21,6 +21,7 @@
 package org.lamsfoundation.lams.lesson;
 
 import org.lamsfoundation.lams.learningdesign.Activity;
+import org.lamsfoundation.lams.learningdesign.NullActivity;
 import org.lamsfoundation.lams.lesson.dao.TestLearnerProgressDAO;
 
 
@@ -135,6 +136,17 @@
         assertEquals("it should be qna",this.testSubSeuqenceActivityQNA.getActivityId().longValue(),nextActivity.getActivityId().longValue());
     }
     
+    public void testGetFirstActivityWithinSequenceParentActivity()
+    {
+        testSubSeuquencActivitySR = activityDAO.getActivityByActivityId(TEST_SR_ACTIVITY_ID);
+
+        Activity nextActivity = this.testSequenceActivity.getNextActivityByParent(new NullActivity());
+        
+        assertNotNull("we should have a next activity",nextActivity);
+        assertEquals("it should be share resource",this.testSubSeuquencActivitySR.getActivityId().longValue(),nextActivity.getActivityId().longValue());
+    }
+    
+    
     public void testGetNextActivityByOptionsParentActivity()
     {
         testSubOptionsActivityNB = activityDAO.getActivityByActivityId(TEST_NB_ACTIVITY_ID);