Index: lams_common/src/java/org/lamsfoundation/lams/tool/GroupedToolSession.java
===================================================================
diff -u -r34b959260a0f8f8285793a4481a95ca3580eabc5 -ra8055d3709a546b47686e6e42c417ec223dff996
--- lams_common/src/java/org/lamsfoundation/lams/tool/GroupedToolSession.java	(.../GroupedToolSession.java)	(revision 34b959260a0f8f8285793a4481a95ca3580eabc5)
+++ lams_common/src/java/org/lamsfoundation/lams/tool/GroupedToolSession.java	(.../GroupedToolSession.java)	(revision a8055d3709a546b47686e6e42c417ec223dff996)
@@ -24,10 +24,13 @@
 package org.lamsfoundation.lams.tool;
 
 import java.util.Date;
+import java.util.HashSet;
+import java.util.Set;
 
 import org.lamsfoundation.lams.learningdesign.Group;
 import org.lamsfoundation.lams.learningdesign.ToolActivity;
 import org.lamsfoundation.lams.lesson.Lesson;
+import org.lamsfoundation.lams.usermanagement.User;
 
 
 /**
@@ -76,4 +79,14 @@
 	public void setSessionGroup(Group sessionGroup) {
 		this.sessionGroup = sessionGroup;
 	}
+	
+    /** Get all the learners who may be part of this tool session. */
+    public Set<User> getLearners() {
+    	HashSet<User> users = new HashSet<User>();
+    	if ( sessionGroup != null ) {
+    		users.addAll(sessionGroup.getUsers());
+    	}
+   		return users;
+    }
+
 }
Index: lams_common/src/java/org/lamsfoundation/lams/tool/NonGroupedToolSession.java
===================================================================
diff -u -r34b959260a0f8f8285793a4481a95ca3580eabc5 -ra8055d3709a546b47686e6e42c417ec223dff996
--- lams_common/src/java/org/lamsfoundation/lams/tool/NonGroupedToolSession.java	(.../NonGroupedToolSession.java)	(revision 34b959260a0f8f8285793a4481a95ca3580eabc5)
+++ lams_common/src/java/org/lamsfoundation/lams/tool/NonGroupedToolSession.java	(.../NonGroupedToolSession.java)	(revision a8055d3709a546b47686e6e42c417ec223dff996)
@@ -24,6 +24,8 @@
 package org.lamsfoundation.lams.tool;
 
 import java.util.Date;
+import java.util.HashSet;
+import java.util.Set;
 
 import org.lamsfoundation.lams.learningdesign.ToolActivity;
 import org.lamsfoundation.lams.lesson.Lesson;
@@ -69,4 +71,14 @@
 	public void setUser(User user) {
 		this.user = user;
 	}
+	
+	   /** Get all the learners who may be part of this tool session. */
+    public Set<User> getLearners() {
+    	HashSet<User> users = new HashSet<User>();
+    	if ( user != null ) {
+    		users.add(user);
+    	}
+   		return users;
+    }
+
 }
Index: lams_common/src/java/org/lamsfoundation/lams/tool/ToolSession.java
===================================================================
diff -u -r34b959260a0f8f8285793a4481a95ca3580eabc5 -ra8055d3709a546b47686e6e42c417ec223dff996
--- lams_common/src/java/org/lamsfoundation/lams/tool/ToolSession.java	(.../ToolSession.java)	(revision 34b959260a0f8f8285793a4481a95ca3580eabc5)
+++ lams_common/src/java/org/lamsfoundation/lams/tool/ToolSession.java	(.../ToolSession.java)	(revision a8055d3709a546b47686e6e42c417ec223dff996)
@@ -23,14 +23,16 @@
 /* $$Id$$ */
 package org.lamsfoundation.lams.tool;
 
-import org.lamsfoundation.lams.learningdesign.ToolActivity;
-import org.lamsfoundation.lams.lesson.Lesson;
-
 import java.io.Serializable;
 import java.util.Date;
+import java.util.Set;
+
 import org.apache.commons.lang.builder.EqualsBuilder;
 import org.apache.commons.lang.builder.HashCodeBuilder;
 import org.apache.commons.lang.builder.ToStringBuilder;
+import org.lamsfoundation.lams.learningdesign.ToolActivity;
+import org.lamsfoundation.lams.lesson.Lesson;
+import org.lamsfoundation.lams.usermanagement.User;
 
 
 /** 
@@ -70,6 +72,9 @@
     
     private Lesson lesson;
 
+    /** Get all the learners who may be part of this tool session. */
+    public abstract Set<User> getLearners(); 
+
     /** full constructor */
     public ToolSession(Long toolSessionId, 
                        ToolActivity toolActivity, 
Index: lams_common/src/java/org/lamsfoundation/lams/tool/service/ILamsToolService.java
===================================================================
diff -u -r34b959260a0f8f8285793a4481a95ca3580eabc5 -ra8055d3709a546b47686e6e42c417ec223dff996
--- lams_common/src/java/org/lamsfoundation/lams/tool/service/ILamsToolService.java	(.../ILamsToolService.java)	(revision 34b959260a0f8f8285793a4481a95ca3580eabc5)
+++ lams_common/src/java/org/lamsfoundation/lams/tool/service/ILamsToolService.java	(.../ILamsToolService.java)	(revision a8055d3709a546b47686e6e42c417ec223dff996)
@@ -22,10 +22,11 @@
 /* $$Id$$ */
 package org.lamsfoundation.lams.tool.service;
 
-import java.util.List;
+import java.util.Set;
 
 import org.lamsfoundation.lams.tool.IToolVO;
 import org.lamsfoundation.lams.tool.exception.LamsToolServiceException;
+import org.lamsfoundation.lams.usermanagement.User;
 
 
 /**
@@ -49,7 +50,7 @@
      * @return a List of all the Learners who are scheduled to use the content.
      * @exception in case of any problems.
      */
-    public List getAllPotentialLearners(long toolContentID) throws LamsToolServiceException;
+    public Set<User> getAllPotentialLearners(long toolSessionID) throws LamsToolServiceException;
     
     public IToolVO getToolBySignature(final String toolSignature);
     
Index: lams_common/src/java/org/lamsfoundation/lams/tool/service/LamsToolService.java
===================================================================
diff -u -r34b959260a0f8f8285793a4481a95ca3580eabc5 -ra8055d3709a546b47686e6e42c417ec223dff996
--- lams_common/src/java/org/lamsfoundation/lams/tool/service/LamsToolService.java	(.../LamsToolService.java)	(revision 34b959260a0f8f8285793a4481a95ca3580eabc5)
+++ lams_common/src/java/org/lamsfoundation/lams/tool/service/LamsToolService.java	(.../LamsToolService.java)	(revision a8055d3709a546b47686e6e42c417ec223dff996)
@@ -23,12 +23,17 @@
 /* $$Id$$ */
 package org.lamsfoundation.lams.tool.service;
 
-import java.util.List;
+import java.util.HashSet;
+import java.util.Set;
 
+import org.apache.log4j.Logger;
 import org.lamsfoundation.lams.tool.IToolVO;
 import org.lamsfoundation.lams.tool.Tool;
+import org.lamsfoundation.lams.tool.ToolSession;
 import org.lamsfoundation.lams.tool.dao.IToolDAO;
+import org.lamsfoundation.lams.tool.dao.IToolSessionDAO;
 import org.lamsfoundation.lams.tool.exception.LamsToolServiceException;
+import org.lamsfoundation.lams.usermanagement.User;
 
 
 /**
@@ -42,14 +47,24 @@
  */
 public class LamsToolService implements ILamsToolService
 {
+	private static Logger log = Logger.getLogger(LamsToolService.class);
+ 
 	public IToolDAO toolDAO;
+	public IToolSessionDAO toolSessionDAO;
+	
     /**
-     * TODO Implement me!
      * @see org.lamsfoundation.lams.tool.service.ILamsCoreToolService#getAllPotentialLearners(long)
      */
-    public List getAllPotentialLearners(long toolContentID) throws LamsToolServiceException
+    public Set<User> getAllPotentialLearners(long toolSessionId) throws LamsToolServiceException
     {
-        return null;
+    	
+    	ToolSession session = toolSessionDAO.getToolSession(toolSessionId);
+    	if ( session != null ) {
+    		return session.getLearners();
+    	} else {
+    		log.error("No tool session found for "+toolSessionId+". No potential learners being returned.");
+    		return new HashSet<User>();
+    	}
     }
     
     public IToolVO getToolBySignature(final String toolSignature)
@@ -75,4 +90,12 @@
 	public void setToolDAO(IToolDAO toolDAO) {
 		this.toolDAO = toolDAO;
 	}
+
+	public IToolSessionDAO getToolSessionDAO() {
+		return toolSessionDAO;
+	}
+
+	public void setToolSessionDAO(IToolSessionDAO toolSessionDAO) {
+		this.toolSessionDAO = toolSessionDAO;
+	}
 }