– The model has an unclear structure or notation.
Symptoms: The structure of the model or the language or diagrams used causes
questions. The receiver will reject the model, although he or she agrees with its
contents. The remarks made only concern the structure of the model.
Solution: Explain the structure of the model or use structures the receiver is used
to. Introduce new kinds of diagrams describing a well-known situation to explain
the diagram constructs.