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UGC NET CSE | June 2010 | Part 2 | Question: 17

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Generalization is a process of extracting common characteristics from two or more classes and combining them into generalized superclass.

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Generalization is a bottom-up approach in which two lower level entities combine to form a higher level entity. Specialization is opposite to Generalization. It is a top-down approach in which one higher level entity can be broken down into two lower level entity. In specialization, some higher level entities may not have lower-level entity sets at all.

ref : http://www.studytonight.com/dbms/generalization-and-specialization.php

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