An improvement is not demonstrated merely because a planned change was implemented. The team still needs to compare the observed result with the purpose of the change.
ASQ describes Plan-Do-Check-Act as an iterative improvement cycle. ASQ — pdca cycle.
Define the comparison in advance
State what the change is intended to improve and how the result will be assessed. Keep the data boundary and measurement method clear. Otherwise, an unrelated change in product mix or reporting can look like success.
Act on what was learned
If the result supports the change, decide how it should be incorporated into the process. If the result is unclear or disappointing, revise the hypothesis and next trial. Do not rewrite the original objective after seeing the data merely to declare improvement.
For a plush operation, a small controlled trial may answer a focused question better than an immediate broad rollout. The useful output is learning that informs the next decision.
Source reviewed 25 October 2026. Practical interpretation and original illustrations by PLUSHIP / Qunhe; examples are illustrative.
Related reading
Supplier Quality Evidence Needs a Defined Scope
Quality Plans Should Identify Evidence at the Relevant Stage
Material Evidence and Finished-Product Evidence Are Different