Index: lams_common/src/java/org/lamsfoundation/lams/learningdesign/GateActivity.java
===================================================================
diff -u -rd66ffc2bf657d1fe25183aa727b110ed42048d59 -r6fd5ff2bd3a176db44a0ce35295c9b1acd593e10
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/GateActivity.java	(.../GateActivity.java)	(revision d66ffc2bf657d1fe25183aa727b110ed42048d59)
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/GateActivity.java	(.../GateActivity.java)	(revision 6fd5ff2bd3a176db44a0ce35295c9b1acd593e10)
@@ -37,7 +37,7 @@
 /**
  * @hibernate.class
  */
-public abstract class GateActivity extends SimpleActivity implements Serializable
+public abstract class GateActivity extends SimpleActivity implements Serializable, ISystemToolActivity
 {
     
     public static final int LEARNER_GATE_LEVEL = 1;
Index: lams_common/src/java/org/lamsfoundation/lams/learningdesign/GroupingActivity.java
===================================================================
diff -u -rd66ffc2bf657d1fe25183aa727b110ed42048d59 -r6fd5ff2bd3a176db44a0ce35295c9b1acd593e10
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/GroupingActivity.java	(.../GroupingActivity.java)	(revision d66ffc2bf657d1fe25183aa727b110ed42048d59)
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/GroupingActivity.java	(.../GroupingActivity.java)	(revision 6fd5ff2bd3a176db44a0ce35295c9b1acd593e10)
@@ -24,7 +24,6 @@
 package org.lamsfoundation.lams.learningdesign;
 
 import java.io.Serializable;
-import java.util.Date;
 
 import org.apache.commons.lang.builder.ToStringBuilder;
 import org.lamsfoundation.lams.learningdesign.strategy.GroupingActivityStrategy;
@@ -37,7 +36,7 @@
  * A GroupingActivity creates Grouping.
  * @author Manpreet Minhas
  */
-public class GroupingActivity extends SimpleActivity implements Serializable
+public class GroupingActivity extends SimpleActivity implements Serializable, ISystemToolActivity
 {
     /** persistent field */
 	private SystemTool systemTool;