Introduction to Unified Approach to OOA
The analysis and design tools as proposed by each of Booch Jacobson and rumbaugh were different in approach. Each had a distinct way of approaching the analysis of the system and each had its own bottlenecks. As neither of the methods was efficient enough, a new unified approach was developed that included all the important features of the three methods.
The unified approach or UML combines all the powerful features present in the methods of Grady booch, james, rumbaugh and Jacobson and thus creates a new tool for the analysis and modelling of the system. So this approach involves the combination of best features of the individual objects oriented analysis and design methods of Grady Booch, james ,Rumbaugh and lvar Jacobson. The result of this is the unified modelling language (UML) .
In UML a system is represented using five different views that describe the system form different perspectives. Each view is defined by a set of diagrams. A view may be represented by a single diagrams. The views present in UML are:
1. Structural Model View : Static structures i.e. classes objects relationships etc. Are modelled.
2. Behavioural Model View: it represent the dynamic aspects of a system. It also depicts the interactions or collaboration between various structural element described in other views:
3. User Model view This view represents system from the user perspective.
4. Implementation Model View : The structural and behavioural aspects o f the system are represented as they are:
5. Environment Model View :The structural and behavioural aspects of the environment in which the system is to be implemented are represented.
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