Index: lams_common/src/java/org/lamsfoundation/lams/learningdesign/ChosenGrouper.java
===================================================================
RCS file: /usr/local/cvsroot/lams_common/src/java/org/lamsfoundation/lams/learningdesign/ChosenGrouper.java,v
diff -u -r1.1 -r1.2
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/ChosenGrouper.java	24 Mar 2005 06:19:25 -0000	1.1
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/ChosenGrouper.java	28 Mar 2005 05:47:52 -0000	1.2
@@ -22,6 +22,7 @@
 
 package org.lamsfoundation.lams.learningdesign;
 
+import java.io.Serializable;
 import java.util.List;
 
 import org.lamsfoundation.lams.usermanagement.User;
@@ -34,7 +35,7 @@
  * @version
  * 
  */
-public class ChosenGrouper implements Grouper
+public class ChosenGrouper implements Grouper,Serializable
 {
 
     /**
Index: lams_common/src/java/org/lamsfoundation/lams/learningdesign/RandomGrouper.java
===================================================================
RCS file: /usr/local/cvsroot/lams_common/src/java/org/lamsfoundation/lams/learningdesign/RandomGrouper.java,v
diff -u -r1.1 -r1.2
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/RandomGrouper.java	24 Mar 2005 06:19:25 -0000	1.1
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/RandomGrouper.java	28 Mar 2005 05:47:52 -0000	1.2
@@ -22,6 +22,7 @@
 
 package org.lamsfoundation.lams.learningdesign;
 
+import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.Iterator;
@@ -55,7 +56,7 @@
  * @version 1.1
  * 
  */
-public class RandomGrouper implements Grouper
+public class RandomGrouper implements Grouper , Serializable
 {
     //---------------------------------------------------------------------
     // Grouping algorithm Implementation Method
Index: lams_common/src/java/org/lamsfoundation/lams/learningdesign/strategy/SimpleActivityStrategy.java
===================================================================
RCS file: /usr/local/cvsroot/lams_common/src/java/org/lamsfoundation/lams/learningdesign/strategy/SimpleActivityStrategy.java,v
diff -u -r1.1 -r1.2
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/strategy/SimpleActivityStrategy.java	21 Mar 2005 04:46:16 -0000	1.1
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/strategy/SimpleActivityStrategy.java	28 Mar 2005 05:47:52 -0000	1.2
@@ -6,6 +6,8 @@
  */
 package org.lamsfoundation.lams.learningdesign.strategy;
 
+import java.io.Serializable;
+
 import org.lamsfoundation.lams.learningdesign.Activity;
 
 
@@ -17,7 +19,7 @@
  * TODO To change the template for this generated type comment go to
  * Window - Preferences - Java - Code Style - Code Templates
  */
-public abstract class SimpleActivityStrategy {
+public abstract class SimpleActivityStrategy implements Serializable {
 	
 	public static final int MODERATION = 1;
 	public static final int DEFINE_LATER = 2;
Index: lams_common/src/java/org/lamsfoundation/lams/lesson/ActivityStrategy.java
===================================================================
RCS file: /usr/local/cvsroot/lams_common/src/java/org/lamsfoundation/lams/lesson/Attic/ActivityStrategy.java,v
diff -u -r1.2 -r1.3
--- lams_common/src/java/org/lamsfoundation/lams/lesson/ActivityStrategy.java	24 Feb 2005 04:11:33 -0000	1.2
+++ lams_common/src/java/org/lamsfoundation/lams/lesson/ActivityStrategy.java	28 Mar 2005 05:47:52 -0000	1.3
@@ -20,6 +20,7 @@
  */
 package org.lamsfoundation.lams.lesson;
 
+import java.io.Serializable;
 import java.util.Iterator;
 
 import org.lamsfoundation.lams.learningdesign.Activity;
@@ -35,7 +36,7 @@
  * @author Jacky Fang 2005-2-23
  * 
  */
-public abstract class ActivityStrategy
+public abstract class ActivityStrategy implements Serializable
 {
     /**
      * <p>Check up all children completion status for a complex activity. </p>