• Similar to compilers

• Input specifications are high-level, special-purpose abstractions from a narrow application domain.

• Code expansion ratio can be high.

• Examples: database generators, report generators, compiler generators.

• Abstraction: reuse the system architecture, major subsystems, data structures and algorithms.

• Selection: Choose an application generator for application domain.

• Specialization: generated from the input specification.

• Integration: none if single system is generated. In terms of domain abstractions ( e.g., tokens passed between LEX and YACC) otherwise.

• Cognitive distance: Low when fit to application domain is good.

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