Companion to the Pareto article; use for project charter training and consistent quality meeting language.
Compare two category schemes on one dataset; require top three projects in the 70–80% cumulative band with metrics.
Connect to 8D/DMAIC Define.
Drifting category definitions distort ranking; Pareto is not root cause.
Apply red-line rules for safety/regulatory tails — do not cut them mechanically by percentage.