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- Layer smarter components on top of dumb ones
- Reuse library functions as much as possible. Internal
reusability is a good predictor of external resuability.
- Layers add control and coordination that allow simple
components to be used in complex ways.
- Layering results in ``black box'' reuse of full components
rather than ``white box'' reuse-with-mangling of their parts.
Properties (e.g., specs, tests) of the full components may be
relied on without having to re-establish.
Sat Apr 8 09:58:22 EDT 1995