Scavenging: copy as much as possible from existing design or code, modify it for current application.

• CS education is design scavenging! Programmer knows a library of reusable designs.

• Reuse works better if code is designed for reuse; but it is hard to get people to do this.

• Abstraction: designs or source code fragments represent informal concepts.

• Selection: informal. Programmer must remember or find reusable code.

• Specialization: manually edit code. This may introduce errors; cannot ``reuse'' validation.

• Integration: modify code and/or context of use.

• Cognitive distance: may be large unless reusing one's own code.

For a software reuse technique to be effective, it must be easier to reuse the artifacts than it is to develop the software from scratch.

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