Lag Measure
A lag measure is a number that tracks the result you ultimately want — revenue closed, pounds lost, a book finished. It confirms success but arrives too late to act on, which is why every lag measure needs supporting lead measures. In a 12-week plan, each goal is defined by one lag measure.
Lag measures are how you define a 12-week goal precisely: '$30k MRR by week 12,' 'sub-25-minute 5k,' '60,000-word draft complete.' They are the verdict the quarter will be judged by, and their falsifiability is what separates a goal from a wish. If the lag measure can't be read off as true or false on the last day, the goal isn't specified yet.
Their limitation is timing. By the time a lag measure moves — or fails to — the behavior that caused it is weeks in the past. You cannot manage a quarter by staring at MRR, because MRR in week 6 reflects outreach in week 2. This is why the 12 Week Year has you score tactics (lead measures) weekly while the lag measure is checked only periodically.
The practical pattern: one lag measure per goal, reviewed every week or two without anxiety, while the weekly scorecard tracks the lead measures you actually control. If the lead measures hold at 85%+ and the lag measure still doesn't move after several weeks, the signal is strategic — your tactics are the wrong ones, not under-executed ones.
See also
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