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ISO 19011: What It Is, and How It Differs from ISO 17021
ISO 19011 gives guidelines for auditing management systems: how to plan, run and follow up audits, and what makes a competent auditor. It’s guidance, not a requirement you certify to. That’s what separates it from ISO 17021, which sets the rules for the bodies that grant certification.
Why is ISO 19011 important?
ISO 19011 is important because it gives organizations a consistent, credible method for auditing their management systems. Following its guidance makes audits more objective and evidence-based, so findings hold up and improvements actually follow. It underpins both internal and supplier audits, which means audit results carry the same weight across teams and sites.
What does ISO 19011 cover?
It’s the practical playbook for running audits well:
- Principles of auditing, like evidence-based and independent.
- Managing an audit programme across the year.
- Planning and conducting individual audits.
- Auditor competence and evaluation.
- It applies to internal and external audits alike.
How does ISO 19011 differ from ISO 17021?
Guidance versus rules. ISO 19011 offers guidance any organization can use to audit its own or its suppliers’ systems, the backbone of a good internal audit programme. ISO 17021 sets the requirements certification bodies must meet to grant certificates. One helps you audit; the other governs who can certify. A compliance audit draws on ISO 19011 for method.
ISO 19011 vs ISO 17021 at a glance
How to audit versus who can certify.
| Aspect | ISO 19011 | ISO 17021 |
|---|---|---|
| Type | Guidance | Requirements |
| For | Anyone auditing systems | Certification bodies |
| Covers | How to run audits | Rules for certifying |
| Certify to it? | No | It governs certifiers |
Related Terms
- External Audit – the independent check.
- Audit – the parent concept.
