Introduction

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By abstraction it is meant that a person modelling a system in object-oriented terms can avoid having to worry about the details of computer memory and instructions, and how a particular piece of data might be represented on a computer. It is possible to model and reason about a system in terms that are meaningful in the real world, so for example each of the following can be modelled and talked about in object-oriented terms:

The modelling of system components and behaviour at an abstract level does not mean that we are being vague – object-oriented models are used as the basis for program design and implementation. However, object-oriented analysis and design does mean that some of the more precise details can be put to one side until a later, probably design, stage takes place. 

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