A control plan sets out how a process is monitored after it has been improved: which characteristics are measured, by what method, how often, by whom, and — the part that matters — what happens when a measurement falls outside limits.
That last element is the one routinely left out, and without it the rest is data collection rather than control. A measurement with no defined response changes nothing; it just documents the drift.
The reason it exists is that improvements decay. Conditions shift, people move on, workarounds accumulate, and within a year the gain is gone. A control plan is the difference between an improvement that holds and one that is quietly reversed while everyone believes the project succeeded.
Em termos de DMAIC, esta é a fase de Controlo tornado concreta, motivo pelo qual um projeto encerrado sem a mesma não está realmente concluído, independentemente do que diga o relatório de encerramento.
Plans fail by covering too much. Twenty monitored characteristics get ignored inside a month. Control the few that actually predict the outcome and let the rest go.
