Principlev1PR-900
Trace recurring errors to their structural invariant…
Trace recurring errors to their structural invariant—the constant factor present across all instances—rather than the circumstantial variables that differ between instances.
Why This Is a Principle
This principle derives from The behavior of a system arises from its structure… (system behavior arises from structure) and Automatic Pattern Perception (pattern recognition). It prescribes a specific method for root cause analysis: find what doesn't vary across error instances. The invariant is the structural cause.