Tight Coupling & Loose Coupling
Updated 2026-08-11
INTRODUCTION
English translation pending.
CORE DEFINITION
Coupling describes how strongly the parts of a system depend on one another. In a tightly coupled system, components are interdependent and lack buffers, so a disturbance travels along the shortest path at high speed and leaves almost no time for human intervention. Loosely coupled systems use buffers, slack, redundancy, and replaceable interfaces to absorb disturbances, so a local failure stays local. Charles Perrow's analysis of normal accidents made the distinction central to safety engineering: what matters is the speed of failure propagation and the controllability of the system, not how advanced it is.
SCAFFOLDING EFFECT
Reduce cognitive load
- Dependency trace: map the chain and flag the links that have no buffer - Time budget: estimate how long you would have to intervene after a failure - Isolation test: verify by drill whether a local failure stays local
Anchor fast decisions
When components depend on one another without slack, a disturbance at one point becomes an input at the next point almost immediately, so the failure travels faster than any operator can react. Buffers, redundancy, and replaceable interfaces interrupt that chain by absorbing the disturbance or allowing the link to be cut. The design question is therefore about propagation speed and intervention time rather than component quality. A tightly coupled system can fail catastrophically even when every part meets its specification, which is why redundant parts alone do not fix it.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- mungermodels.comhttps://mungermodels.com/models/tight-coupling-loose-couplingverified
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