Cognitive Scaffold

Preparing your thinking workspace

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MENTAL MODEL · M1542

Error Budget

Error Budget
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

If your Service Level Objective (SLO) is 99.9%, then the remaining 0.1% is your error budget. As long as this budget is not exhausted, the team can aggressively release new features and run experiments; once it is used up, innovation must stop and all efforts must go into fixing bugs.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

Quantify risk tolerance. It resolves the conflict between development (seeking speed) and operations (seeking stability). As long as the system is stable enough (has budget), developers are allowed to make changes freely. This is a 'quota-based' innovation management.

anchor

Anchor fast decisions

Within an acceptable Service Level Objective (SLO), allow a certain percentage of failure time; this 'budget' is used to balance innovation speed and stability.

MINIMUM ACTION

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Practice this model in one real situation:

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Source support: Explicit

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    sre.googlehttps://sre.google/sre-book/embracing-risk/ZH · Explicit
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