... interests us. A good model should: Aid communication A model that is difficult to read or understand is of no use. Projects of various sizes all depend upon communication - exchanging ideas, discussing proposals, understanding requirements. A model should aid all ideas. There is no use communicating a complex model as it will be difficult to understand, to verify and to maintain. A test which can be applied to any model is to give someone unconnected with the system and ask them what the model represents. If they describe the system accurately then a good model has been produced. Fits its purpose A good model should have an explicit purpose that everyone uses it recognises. Project models are produced at many different stages of a project life cycle for various purposes. This includes: * physical models showing the system as it is currently exists, with implementation details - who does what and where * logical models showing the ...

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