Index: /trunk/quest-ui-core/pom.xml
===================================================================
--- /trunk/quest-ui-core/pom.xml	(revision 728)
+++ /trunk/quest-ui-core/pom.xml	(revision 729)
@@ -54,4 +54,9 @@
     </dependency>
     <dependency>
+      <groupId>de.ugoe.cs.quest</groupId>
+      <artifactId>quest-core-usability</artifactId>
+      <version>0.0.1-SNAPSHOT</version>
+    </dependency>
+    <dependency>
       <groupId>net.sf.jung</groupId>
       <artifactId>jung-visualization</artifactId>
Index: /trunk/quest-ui-core/src/main/java/de/ugoe/cs/quest/ui/commands/CMDevaluateUsability.java
===================================================================
--- /trunk/quest-ui-core/src/main/java/de/ugoe/cs/quest/ui/commands/CMDevaluateUsability.java	(revision 729)
+++ /trunk/quest-ui-core/src/main/java/de/ugoe/cs/quest/ui/commands/CMDevaluateUsability.java	(revision 729)
@@ -0,0 +1,79 @@
+
+package de.ugoe.cs.quest.ui.commands;
+
+import java.security.InvalidParameterException;
+import java.util.List;
+
+import de.ugoe.cs.quest.CommandHelpers;
+import de.ugoe.cs.quest.tasktrees.treeifc.ITaskTree;
+import de.ugoe.cs.quest.usability.UsabilityEvaluationManager;
+import de.ugoe.cs.quest.usability.UsabilityEvaluationResult;
+import de.ugoe.cs.util.console.Command;
+import de.ugoe.cs.util.console.GlobalDataContainer;
+
+/**
+ * <p>
+ * This command performs a usability evaluation based on a task tree. It uses the
+ * {@link UsabilityEvaluationManager} for this purpose. Please consult the documentation of the
+ * usability evaluation manager for more details.
+ * </p>
+ * 
+ * @author Patrick Harms
+ * @version 1.0
+ */
+public class CMDevaluateUsability implements Command {
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see de.ugoe.cs.util.console.Command#help()
+     */
+    @Override
+    public String help() {
+        return "evaluateUsability <tasktree> {<evaluationResult>}";
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see de.ugoe.cs.util.console.Command#run(java.util.List)
+     */
+    @Override
+    public void run(List<Object> parameters) {
+        String tasktreeName;
+        String evaluationResult;
+        try {
+            tasktreeName = (String) parameters.get(0);
+            if (parameters.size() > 1) {
+                evaluationResult = (String) parameters.get(1);
+            }
+            else {
+                evaluationResult = "usabilityEvaluationResult";
+            }
+        }
+        catch (Exception e) {
+            throw new InvalidParameterException("must provide a task tree name");
+        }
+
+        Object dataObject = GlobalDataContainer.getInstance().getData(tasktreeName);
+        if (dataObject == null) {
+            CommandHelpers.objectNotFoundMessage(tasktreeName);
+            return;
+        }
+        if (!(dataObject instanceof ITaskTree)) {
+            CommandHelpers.objectNotType(tasktreeName, "ITaskTree");
+            return;
+        }
+
+        ITaskTree taskTree = (ITaskTree) dataObject;
+        
+        UsabilityEvaluationResult result =
+            new UsabilityEvaluationManager().evaluateUsability(taskTree);
+        
+        if (GlobalDataContainer.getInstance().addData(evaluationResult, result)) {
+            CommandHelpers.dataOverwritten(evaluationResult);
+        }
+        
+    }
+
+}