Working definition
Lag vs Lead is the discipline of measuring not the outcome of the Battle but the daily action that produces it — so the calibration loop can still influence what it points at.
How it works
Every Battle has two measurable surfaces:
- The lag measure is the result — fewer emails CC’d to me at the end of the week, the partner I no longer fight with on Sunday, the body that lost five kilograms by April. It is what arrives at the end of the run. Yann’s vocabulary: la résultante, la vanité métrique — true but useless for action, because it can only be observed, not influenced.
- The Lead Measure is the daily move that produces the result — each time a new context arose, did I communicate the protocol; each time the partner triggered me, did I run the interoception switch; each meal, did I serve the body what the body asked. It is where the agency lives. Yann’s vocabulary: le lit de mesure, c’est où est-ce que j’agis au quotidien pour que ça se réalise.
The discipline is to calibrate the lead, not the lag. The lag tells you whether you won; the lead is what you can still move today. Calibrating the lag is essentially reading the result tape — it produces relief or disappointment, never action. Calibrating the lead produces the next move within the same day, while there is still time to influence the outcome.
The trap is the seduction of vanity metrics. The result number is satisfying — it is concrete, it ranks well in conversation, it can be screenshotted. But it is structurally incapable of being influenced once it lands. Pair every lag with its lead, and the loop closes.
Signature
The image is lag on the scoreboard, lead on the daily calendar — Yann on 2026-02-16: Le lac mesure, c’est la résultante… Le lit de mesure, c’est où est-ce que j’agis au quotidien. Every Battle ships lag and lead on the same line.
Spatial split — lag (result tape, after the fact) versus lead (daily move you still influence). Atlas: Lag Measure · Lead Measure. Your move: Your move this week.
More room passes mention this doctrine in replay narrative — search the Codex for Lag vs Lead Measure or start from the latest entry on Weekly Sessions.
Your move this week
This week’s micro-action (24–72 hours):
- Lag: What does the result look like at the end of the week?
- Lead: What is the one daily action that produces it?