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Standard Operating Procedure

Also known as: SOP, Operating Procedure, Standard Procedure

A documented set of step-by-step instructions that defines how a recurring task or process should be performed.

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A standard operating procedure (SOP) is the written, step-by-step record of how a recurring task should be done. [1] It captures the steps, the sequence, the tools, and the expected outcome of each step, so any trained worker can run the process the same way every time. [2] The point is consistency. Three operators on three shifts should land in the same place, hit the same quality bar, and follow the same safety steps. [1] When it stays current, the SOP becomes the reference that training, audits, and compliance checks all point back to. [2]

Key characteristics

  • Has a defined purpose and scope that says where, when, and to whom the procedure applies. [3]
  • Names who is responsible for performing, reviewing, and approving the work. [3]
  • Lists the steps in order, in active voice, with a clear expected outcome for each step. [2]
  • Cites the supporting documents, regulations, or standards behind the work. [3]
  • Carries a version number, an owner, an approval sign-off, and a last-reviewed date so anyone reading it can tell if it is current. [3]

Example

Cleaning a CNC machine at end of shift

A 20-person machine shop writes an SOP titled 'CNC End-of-Shift Cleaning'. It states the purpose (prevent chip buildup that causes tolerance drift on the next shift), lists the required PPE, and walks through 9 steps: power down spindle, remove chuck, vacuum chip tray, wipe ways with non-residue solvent, inspect coolant level, log cleaning in the shift book, and so on. Each step has a one-line acceptance criterion. The SOP is owned by the shift supervisor, reviewed every six months, and printed at the workstation.

How SOPX handles this

SOPX turns SOP writing into a recording task. Film the process on a phone, or screen-record a software workflow, and the AI extracts the steps, trims the clips, and drafts the descriptions. A supervisor reviews and publishes in under 10 minutes. Operators open the SOP by scanning a QR code at the workstation, in any of 50+ languages. If the procedure already exists as a PDF, you can import it and SOPX parses it into a structured digital SOP with steps, descriptions, and images.

Related use case: Video to SOP →

Frequently asked questions

What is the difference between an SOP and a policy?
A policy says what the rule is and why it matters (for example, 'all machines must be cleaned at end of shift'). An SOP says exactly how to follow that rule (the 9 specific steps, in order, that cleaning involves). Policies set direction. SOPs make that direction executable on the floor.
Who should write an SOP?
The person who actually does the work, with input gathered from operators on the floor and a review by a supervisor or quality lead. [3] The worst SOPs are written by managers who have not done the task in years, because they skip the small decisions and exceptions that matter. The best ones come from filming or shadowing the operator who already does the job well.
How long should an SOP be?
As long as the task requires and not a word longer. A simple cleaning routine might be 5 to 10 steps on a single page. A multi-station assembly process might span several linked SOPs. If you find yourself writing more than about 15 steps in one document, that is usually a sign to split it into smaller, linked procedures.
How often should SOPs be reviewed?
Most teams review them every six to twelve months, and any time the underlying process, equipment, or regulation changes. [2] Many ISO 9001 and HACCP programs require an explicit review date on every controlled document, so tying review to a calendar reminder for the SOP owner is the easiest way to keep documents from going stale.
Are SOPs required for ISO 9001 certification?
ISO 9001 effectively requires documented procedures for any process that could affect product or service quality, though it does not prescribe a specific format. [1] SOPs are the most common way companies meet that requirement, because they are easy to version, audit, and train against.

Sources

Statements above draw on the references below. Numbers in the text link to the matching entry.

  1. [1]
    Standard operating procedure
    Wikipedia · Accessed 2026-04-28
  2. [2]
    Standard operating procedure (SOP)
    TechTarget · Accessed 2026-04-28
  3. [3]
    Standard Operating Procedures: Importance and Best Practices
    Safety Management Group · Accessed 2026-04-28

Related terms

Tags

documentation compliance iso manufacturing training

Last reviewed: 2026-04-28

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