From Systemantics: How Systems Really Work and How They Fail:
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.
A complex system that works always evolves from {a simple system that worked}.
Q. Gall’s Law suggests what cure if you find yourself struggling with a complex system that doesn’t work?
A. Start over from a working simple system.