Index: lams_common/src/java/org/lamsfoundation/lams/learningdesign/Grouping.java
===================================================================
diff -u -rb125be1bc92a6f11535ffa059b15a519c741b40e -r85592985e7c0ff8c521939c92f1a3da4639c5f73
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/Grouping.java	(.../Grouping.java)	(revision b125be1bc92a6f11535ffa059b15a519c741b40e)
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/Grouping.java	(.../Grouping.java)	(revision 85592985e7c0ff8c521939c92f1a3da4639c5f73)
@@ -288,8 +288,13 @@
 	    this.grouper.doGrouping(this,learner);
 	}
 	
+	/**
+	 * Return whether a learner is a existing learner for this grouping or not.
+	 * @param learner the current leaner
+	 * @return the boolean result
+	 */
 	public boolean doesLearnerExist(User learner)
 	{
-	    return getGroupBy(learner).isNull();
+	    return !getGroupBy(learner).isNull();
 	}
 }
Index: lams_common/src/java/org/lamsfoundation/lams/learningdesign/RandomGrouper.java
===================================================================
diff -u -rb125be1bc92a6f11535ffa059b15a519c741b40e -r85592985e7c0ff8c521939c92f1a3da4639c5f73
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/RandomGrouper.java	(.../RandomGrouper.java)	(revision b125be1bc92a6f11535ffa059b15a519c741b40e)
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/RandomGrouper.java	(.../RandomGrouper.java)	(revision 85592985e7c0ff8c521939c92f1a3da4639c5f73)
@@ -146,7 +146,7 @@
         for(Iterator i=learners.iterator();i.hasNext();)
         {
             User learner = (User)i.next();
-            if(randomGrouping.doesLearnerExist(learner))
+            if(!randomGrouping.doesLearnerExist(learner))
             {
                 Group selectedGroup = selectGroupToJoin((RandomGrouping)randomGrouping);
                 selectedGroup.getUsers().add(learner);
@@ -185,7 +185,7 @@
         for(Iterator i = learners.iterator();i.hasNext();)
         {
             User learner = (User)i.next();
-            if(randomGrouping.getGroupBy(learner).isNull())
+            if(!randomGrouping.doesLearnerExist(learner))
                 newLearners++;
         }