Standard Operating Procedure, SOP
Updated 2026-08-13
INTRODUCTION
English translation pending.
CORE DEFINITION
A standard operating procedure documents the agreed sequence of steps for a recurring task, specifying inputs, actions, and acceptance criteria at each stage. The core proposition is that variability, not average skill, is the main source of defects, so writing the best-known method down and requiring its use reduces variance and makes the process trainable and auditable. The key qualification is that the procedure must be maintained: a standard that lags behind actual practice misleads operators, and one treated as unchangeable blocks the improvement it was meant to enable.
SCAFFOLDING EFFECT
Reduce cognitive load
- Step decomposition: break the process into ordered steps with defined inputs and outputs. - Acceptance criteria: state how each step is verified as complete before the next begins. - Revision loop: capture operator feedback and update the procedure on a fixed cycle.
Anchor fast decisions
When each operator improvises, the output distribution is wide and defects are hard to attribute to any specific step. A written standard narrows the distribution by removing avoidable variation, so remaining defects point to genuine process limits. Standardization also makes the task learnable and lets the process be improved deliberately rather than rediscovered by each worker.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Standard_operating_procedureverified
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