• A small amount of source code expands to a large amount of output code.

• A linear (n + m) set of source modules allows a combinatorial (n * m) set of possible implementations.
  Set = { list, array, tree }
  Operation = { sum, average, max, min }

• A program can be specified by a small number of choices rather than by specifying all the consequences of those choices.

• A program can be specified in terms of domain concepts rather than programming concepts.

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