In plain English
A deliberately chosen measurement used to judge progress towards an objective.
Why it matters
This instrument can help answer a focused measurement question when it is connected to a real objective and read alongside relevant context.
Example
A small organisation records this signal for a defined page and period, then compares it with related instruments before deciding whether to investigate a change.
Common misunderstanding
A KPI should connect to a decision and goal. Supporting metrics can explain it, but more metrics do not automatically improve decisions.