• Similar to reuse of code, but more abstract.

• A wider range of things can be parameterized: code, data types, etc.

• Abstraction: abstracts code, data structures.

• Selection: there may be machine help in finding possibly applicable modules. Must then prove preconditions.

• Specialization: substituting language constructs into parameterized parts of schema, or choosing options.

• Integration: done in implementation language, or by composing schemas.

• Cognitive distance: abstraction allows description of what rather than how. However, formal description of even simple abstractions is difficult.

Contents    Page-10    Prev    Next    Page+10    Index