The notation is not too complex to learn and the external view of some of the icons gives readers a direct projection of the inbuilt concept. Example Inheritance relationships can be shown on the same model, but are generally better shown in a separate Inheritance Model. Objectcharts are enhanced state transition diagrams applied to single object classes.
Event models show message-passing sequences between a set of collaborating objects.
Event models are often used to formalise scenarios or use cases. The service structure model is used significantly less often. It applies structured design techniques to the internal representation of individual methods . This is needed when building large scale systems. Textual Deliverables There are eight textual deliverables.