What Is an SOP? Definition, Structure and Example
Contents
Short answer
An SOP (standard operating procedure) is a written, approved description of how a recurring process must be carried out, by whom and to which standard. SOPs make work consistent, safe and auditable. Actarion converts existing SOPs with AI into step-by-step digital instructions that operators follow with AR guidance, with every execution logged.
Why do SOPs cause headaches?
- SOPs live in a document system the shop floor never opens.
- Before every audit, quality spends days checking whether practice matches paper.
- Nobody can prove that the current version was followed on a given shift.
- Long, dense SOPs get skipped. Operators rely on memory instead.
What is an SOP?
An SOP is a controlled document that fixes how a process is done. "Controlled" means it has an owner, a version, an approval and a review date. SOPs are required or expected in regulated settings such as GMP in pharma and food, and in management systems such as ISO 9001.
An SOP sits in a document hierarchy:
| Level | Document | Answers |
|---|---|---|
| 1 | Policy / quality manual | Why and what do we commit to? |
| 2 | SOP / procedure | What happens, who does it, when? |
| 3 | Work instruction | How exactly is one task done? |
| 4 | Records / forms | Proof that it was done |
What does an SOP contain?
- 1Header. title, ID, version, owner, approval, effective date.
- 2Purpose. one or two sentences on why the procedure exists.
- 3Scope. which sites, lines, products and roles it covers.
- 4Definitions. terms and abbreviations used.
- 5Responsibilities. who does, checks and approves what.
- 6Procedure. the steps, in order, with references to work instructions.
- 7Records. which evidence is kept and where.
- 8References and revision history.
Get this structure ready-made in our SOP template.
How do you write an SOP?
- 1Map the process with the people who do it, on the floor.
- 2Agree on the one best way and write it down in plain language.
- 3Keep steps short and active.
- 4Have it reviewed by operations, quality and HSE.
- 5Train the people involved and record the training.
- 6Set a review date and stick to it.
SOP example
SOP-QA-014: Line clearance before product changeover (food packaging)
- Purpose: prevent mix-ups of product, packaging or labels.
- Scope: packaging lines 1–4.
- Responsibilities: operator performs; team leader verifies; QA samples weekly.
- Procedure: remove all previous materials → clean contact parts per WI-114 → check labels and date coding → team leader signs off → start.
- Records: line clearance checklist, retained 2 years.
Common mistakes
- Mixing SOP and work instruction. A 40-page SOP with every bolt in it gets out of date fast.
- Writing for the auditor, not the operator. If the floor can't use it, it won't be followed.
- No owner or review date.
- Paper sign-offs that nobody checks. The record exists, but it proves little.
How do you measure success?
Measure before you change anything. Record a baseline for two to four weeks, then compare after the rollout using the same definitions. These KPIs are the most useful:
| KPI | What it tells you | How you measure it |
|---|---|---|
| SOPs past review date | Whether documents stay current | Count of SOPs overdue for review |
| Deviations per SOP | Whether the SOP works in practice | Deviations per 1,000 executions |
| Audit findings | Whether SOPs satisfy auditors | Findings related to procedures per audit |
| Read-and-understood status | Whether people know the latest version | Share of staff signed off on the current revision |
Keep the list short: three KPIs that the team leader reviews every week beat ten that nobody looks at. Agree on the definitions with quality and finance up front, so the results hold up in a business case.
How Actarion helps
- AI authoring: upload your SOPs and get structured, step-by-step digital instructions as a draft.
- AR guidance: operators follow the steps at the machine on a tablet or AR glasses.
- Audit-proof by default: time, confirmations, photos and deviations are logged per execution.
- One live version: changes are approved centrally and reach every workstation at once.
- Pilot with fixed KPIs, delivered with technology partner DeepSight.
Read more about SOP software.
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Download the free SOP template to standardize your next procedure.
Frequently asked questions
SOP stands for standard operating procedure: an approved description of how a recurring process is done.
An SOP covers the process and responsibilities. A work instruction explains one task step by step at the workstation.
Set a fixed interval, often one to three years, and review earlier after any change to the process, equipment or regulation.
Yes, if version control, approval and records are controlled. In regulated environments such as pharma, electronic records must also meet the applicable rules, such as EU GMP Annex 11 or FDA 21 CFR Part 11.
