1.8 Summary and Test
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    Abstraction is about looking only at the information that is relevant at the time.
    When modelling 2 or 3 orthogonal views of the system are created.
    Diagrams are independent views of the model and may be of different types.
    In structured analysis the functional view is the primary view of the system.
    In object oriented analysis, the object model, or data view, is the primary, and most stable view of the system.
    Hardware engineering produces well encapsulated hardware designs
    Applying encapsulation techniques to software encourages maintainable, re-useable and extensible code.


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