The requirement model is structured in analysis model The analysis model is formed from the use case model. Each use case will be entirely divided into objects of the three types described in the previous section. In the requirements model we specify the entire functionality of the system. This functionality should now be structured to obtain a robust and extensible structure. Use Cases will be partitioned into analysis objects. Functionality specified in the use cases should be allocated to different objects. Each use case will be offered by objects in the analysis model. An object can of course be common to several use cases.How to partition Use Cases into Analysis Objects?We partition the use case according to the following principles:Those use case functionality which are directly dependent on the system's environment are placed in interface objects.Those functionalities dealing with the storage and handling of information which are not naturally placed in any interface object are placed in the entity objects.Functionality specific to one or a few use cases and not naturally placed in any of the other objects are placed in control objects.

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