governance
Diagnostic signal
A defined observation or pattern that prompts investigation because the current process may no longer match its baseline, without by itself proving a cause or prescribing a response.
This is an editorial synthesis. A signal becomes actionable only when its measure, baseline, rule and investigation owner are declared. A threshold copied from another process is not automatically meaningful.
Sources
- NIST/SEMATECH e-Handbook — What Are Variables Control Charts? · primary
- NIST/SEMATECH e-Handbook — Experiments and Experimental Design · primary