diff --git a/src/exceptions/IllegalTypeException.java b/src/exceptions/IllegalTypeException.java
new file mode 100644
index 0000000..cef3cc9
--- /dev/null
+++ b/src/exceptions/IllegalTypeException.java
@@ -0,0 +1,9 @@
+package exceptions;
+
+public class IllegalTypeException extends RuntimeException {
+
+	public IllegalTypeException(String msg) {
+		super(msg);
+	}
+	
+}
diff --git a/src/models/Dependency.java b/src/models/Dependency.java
index b41abeb..2704a4b 100644
--- a/src/models/Dependency.java
+++ b/src/models/Dependency.java
@@ -52,6 +52,9 @@
 		return getOrder() - 1;
 	}
 	
+	public boolean isDependeingTermEvaluatable() {
+		return dependingTerm instanceof EvaluatableTerm;
+	}
 	
 	
 	@Override
diff --git a/target/classes/models/Dependency.class b/target/classes/models/Dependency.class
index 36f0861..347c461 100644
--- a/target/classes/models/Dependency.class
+++ b/target/classes/models/Dependency.class
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