Abstraction
``Successful application of a reuse technique to a software engineering
technology is inexorably tied to raising the level of abstraction for
that technology.''
Every software abstraction has two levels:
- Specification
- Realization
If there are multiple levels, the realization of one level may be the
specification of the next lower level.
An abstraction has several parts:
- hidden part: details of the realization that are not visible
in the specification
- variable part: the part of the specification that can be varied
- fixed part: the part of the specification that is fixed
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