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Gall’s Law: the Relationship of Simple to Complex Systems

a rule of thumb for systems design from Gall's book Systemantics: How Systems Really Work and How They Fail. It states:

A complex system that works is invariably found to have evolved from a simple system that worked. A complex system designed from scratch never works and cannot be patched up to make it work. You have to start over with a working simple system.

– John Gall (1975, p.71) Wikipedia