MENTAL MODEL · M7814

Just-In-Time, JIT

BusinessmediumManagement

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Updated 2026-08-10

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INTRODUCTION

English translation pending.

CORE DEFINITION

Just-in-time production makes the needed product, in the needed quantity, at the needed time, minimizing inventory and waste across the process. Inventory is the fig leaf that hides waste, so JIT deliberately removes the buffer that masks defects and bottlenecks, forcing each process problem into the open where it must be solved rather than stored.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Pull, do not push: each downstream step takes only what the next one actually needs - Shrink the batch: smaller lots and frequent replenishment expose the real constraint - Let the problem show: never use stock to paper over a defect in the process

anchor

Anchor fast decisions

Stock buffers absorb the noise of defective and unstable processes, so removing the buffer makes every weakness visible at the moment it occurs. Pulling work on demand instead of pushing it forward caps work in progress, and the strain that remains points precisely at the process defect that must be fixed.

MINIMUM ACTION

In progress 0/1

Practice this model in one real situation:

Run pull production so each downstream step takes material on demand 2. Shrink batch sizes and replenish frequently instead of building large stocks 3. Eliminate waiting time and the work in progress it creates 4. Expose each process defect and fix it at the root instead of buffering it

Check to track your progress (stored locally)

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Source support: Explicit

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en.wikipedia.orghttps://en.wikipedia.org/wiki/Lean_manufacturingZH · Explicit
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