Monthly Learning Loop
The third tier of the coherence layer. Its job is to check whether the month’s accumulated learning still fits the quarter’s strategic bets — which assumptions have strengthened, which have weakened, and which are newly visible. Outputs are initiative flex decisions (pause, accelerate, retire, redirect) and an updated assumption register. The common failure mode is leaking downward into a weekly review at monthly frequency, with the assumption register going untouched. (Strategy as Infrastructure, Ch 15)
Why it matters
The monthly learning loop is where assumption management becomes operationally real. If the assumption register is not explicitly reviewed at this tier, it silently rots — producing the assumption debt the book names in Chapter 7. The initiative flex decisions (pause/accelerate/retire/redirect) give this tier teeth: it does not merely observe, it adjusts the portfolio. Teams that skip this tier discover the drift at the quarterly recalibration, by which time the cost of correction has multiplied.
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