diff --git a/prism/src/prism/ModelExpressionTransformationIdentity.java b/prism/src/prism/ModelExpressionTransformationIdentity.java
new file mode 100644
index 00000000..41d7e226
--- /dev/null
+++ b/prism/src/prism/ModelExpressionTransformationIdentity.java
@@ -0,0 +1,49 @@
+package prism;
+
+import jdd.JDD;
+import jdd.JDDNode;
+import parser.ast.Expression;
+
+public class ModelExpressionTransformationIdentity<M extends Model> implements ModelExpressionTransformation<M,M> {
+	private M model;
+	private Expression original;
+	private Expression transformed;
+	private JDDNode statesOfInterest;
+
+	public ModelExpressionTransformationIdentity(M model, Expression original, Expression transformed, JDDNode statesOfInterest)
+	{
+		this.model = model;
+		this.original = original;
+		this.transformed = transformed;
+		this.statesOfInterest = statesOfInterest;
+	}
+	
+	@Override
+	public M getOriginalModel() {return model;}
+
+	@Override
+	public M getTransformedModel() {return model;}
+
+	@Override
+	public StateValues projectToOriginalModel(StateValues svTransformedModel)
+	{
+		return svTransformedModel; 
+	}
+
+	@Override
+	public Expression getTransformedExpression() {return transformed;}
+
+	@Override
+	public Expression getOriginalExpression() {return original;}
+
+	@Override
+	public JDDNode getTransformedStatesOfInterest() {return statesOfInterest.copy();}
+
+	@Override
+	public void clear()
+	{
+		// we don't clear the model
+		JDD.Deref(statesOfInterest);
+	}
+
+}