Terms and definitions — what changed from 2015 to 2026
ISO 9001:2026 published 16 September 2026 · checked against the published text on 27 September 2026
Confirmed in the published text: clause 3 now carries twenty core management-system terms of its own — organisation, interested party, top management, management system and quality management system, policy and quality policy, objective and quality objective, risk, process, competence, documented information, performance, continual improvement, effectiveness, requirement, conformity, nonconformity, corrective action, audit, measurement and monitoring — with ISO 9000 remaining the normative vocabulary behind them. The 2015 edition defined nothing locally. One deliberate gap matters: 'opportunity', which now carries its own sub-clause in 6.1, is still not defined in either document. Annex A.2 adds working clarifications of six word pairs the requirements turn on — appropriate versus applicable, consider versus take into account, continual versus continuous, what 'ensure' means, the two documented-information phrasings, and 'strategic direction'.
ISO 9001:2015 said
Clause 3 contained no definitions — it referred you wholesale to ISO 9000.
ISO 9001:2026 says
Twenty core terms are defined inside clause 3 itself (ISO 9000 stays the full vocabulary); 'conformance' is deprecated in favour of 'conformity'; 'opportunity' remains undefined. Annex A.2 clarifies the words the requirements hinge on.
What to actually do
Use the clause-3 list in internal-auditor training; write your own working definition of 'opportunity' into the risk-and-opportunity process; read A.2 before the next argument about 'appropriate' versus 'applicable' or 'continual' versus 'continuous'.
Full clause guidance
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Checked against the published text of ISO 9001:2026 (SANS 9001:2026 Ed. 6, the identical South African adoption of ISO 9001:2026) on 27 September 2026. Qlause provides interpretive guidance only and is not a substitute for the standard — refer to your licensed copy of ISO 9001:2026 for the authoritative text.