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approach to identifying generalizations comparison table

Subject	divide up	group	have advantage	is an instance of
bottom-up approach to identifying generalizations		similar classes creating a new superclass	normally useful so that reusable components can be created; these can then be used in several places in the overall system	bottom-up design
top-down approach to identifying generalizations	a complex class, creating new subclasses		gives the system being designed a good structure	top-down design

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