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  Object oriented analysis Process

Introduction to Object oriented analysis Process

In the OO a process the scenario of the  usage of the system  has to be understood then modelling  of software begins. These are described in the following sections.

Use Case

Use cases were introduced into object analysis by Jacobson as means of communication with users. They are scripts that describe typical ways that  a system  is or  well be used. A use case is general in the sense  that it doesn't  describe instances of how  a system us used, but  generalizes a numbers of instances into  a general scripts.

1. To define the functional and operational requirements  of the system ( product ) by  defining  a scenario of usage that  is agreed upon  by the end use and the software engineering team.

2. To provide a clear and unambiguous description  of how  the end  users and the system interact with  one  another.

3. To provide a basis for validation testing.

During OOA use cases serves as the  basis for the  first element of the  analysis model. In developing  a use case we identify the  main actors or roles in the system and then describe the way they use or interact with the system, or their behaviour in the system. Use case identification usually begins by looking gat scenarios to check how  these actors  carryout their  activities. We the nose these scenarios to identify  the  usual way  in which  these actors carry  out their activities. A system  is usually  described by  a number of use  cases which  together  become  the use case model.

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