Explain the two criteria that help a designer in determining when to use subtypes and supertypes.

nramos08

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6 years ago

Explain the two criteria that help a designer in determining when to use subtypes and supertypes.

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red r.

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6 years ago

Two criteria help a designer determine when to use subtypes and supertypes:
1 . There must be different, identifiable kinds or types of an entity in the user's environment.
2 . The different kinds or types of instances should each have one or more attributes that are unique to that kind or type of instance.

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