MENTAL MODEL · M12975

Drum-Buffer-Rope

BusinessHigh supportManagement

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Updated 2026-08-22

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INTRODUCTION

English translation pending.

CORE DEFINITION

The drum is the rhythm of the bottleneck resource. The buffer is the inventory that protects the bottleneck. The rope is the signal that controls material release. The scaffold is the synchronization of system rhythm: run the entire system at the pace of the bottleneck, avoiding local speeds that are too fast or too slow. It is the scheduling method of the theory of constraints.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Find the drum: identify the bottleneck and set the system's pace from it. - Size the buffer: place protection only in front of the constraint, not everywhere. - Pull the rope: release material into the system only at the drum's beat.

anchor

Anchor fast decisions

A system's throughput is set by its narrowest stage, so any non-bottleneck running faster does not create output, it only creates inventory and waiting. The drum transmits the constraint's rhythm to the whole system, the buffer absorbs the variability that would otherwise starve the constraint, and the rope prevents upstream overproduction. The three together make local efficiency serve global throughput.

MINIMUM ACTION

In progress 0/1

Practice this model in one real situation:

Identify the bottleneck resource and measure its real capacity. 2. Set the release schedule to match that capacity exactly. 3. Place a time buffer in front of the bottleneck and size it to the measured variability. 4. Run everything else at a pace that serves the bottleneck, and stop protecting non-constraints.

Check to track your progress (stored locally)

Learning progress0%

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Source support: Explicit

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zh.wikipedia.orghttps://zh.wikipedia.org/wiki/%E7%9B%AE%E6%A0%87ZH · Explicit
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