An approach to reuse can be characterized along several dimensions:

1. Abstraction: Abstraction is essential: without it, the artifact to be reused would have to match the new problem exactly.

2. Selection: How does the user locate the desired artifact?

3. Specialization: If an artifact is abstract, it must be specialized for the application. Specialization can be done by parameterization, transformation, or constraints.

4. Integration: How can reusable artifacts be integrated into a complete system? An integration framework such as a module interconnection language may be provided.

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