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Assigning Responsibility for Operation
Many operations might have obvious target objects, but some of these operations could be used at numerous places in an algorithm, by one of many objects. These operations are complex high level operations which can be overlooked in laying out the object classes as they are not an inherent part of any of the class.
Now, obvious question is, how do you know what class owns an operation? It is easy when only one of the objects is involved in operation: You are simply informing the object to perform an operation. But when more than one of the objects is involved in an operation it becomes quite hard. Therefore, we must know which object plays main role in operation. For this, ask yourself following questions:
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