Index: /trunk/EventBenchCore/src/de/ugoe/cs/eventbench/models/IncompleteMemory.java
===================================================================
--- /trunk/EventBenchCore/src/de/ugoe/cs/eventbench/models/IncompleteMemory.java	(revision 252)
+++ /trunk/EventBenchCore/src/de/ugoe/cs/eventbench/models/IncompleteMemory.java	(revision 253)
@@ -1,4 +1,5 @@
 package de.ugoe.cs.eventbench.models;
 
+import java.security.InvalidParameterException;
 import java.util.LinkedList;
 import java.util.List;
@@ -40,6 +41,12 @@
 	 * @param length
 	 *            number of recent events that are remembered
+	 * @throws InvalidParameterException
+	 *             This exception is thrown if the length is smaller than 1
 	 */
 	public IncompleteMemory(int length) {
+		if (length < 1) {
+			throw new InvalidParameterException(
+					"Length of IncompleteMemory must be at least 1.");
+		}
 		this.length = length;
 		history = new LinkedList<T>();
@@ -66,5 +73,11 @@
 	@Override
 	public List<T> getLast(int num) {
-		return new LinkedList<T>(history); // defensive copy
+		if( num<1 ) {
+			return new LinkedList<T>();
+		} else {
+		return new LinkedList<T>(history.subList(
+				Math.max(0, history.size() - num),
+				history.size())); // defensive copy
+		}
 	}