The common skeleton
Modern ISO management system standards use the same ten-clause structure:
| Clause | What it asks |
|---|---|
| 4 — Context | What are we operating in, who has an interest, what is the scope? |
| 5 — Leadership | Has top management taken ownership, is there a policy, are roles assigned? |
| 6 — Planning | Risks, opportunities, legal obligations and objectives. |
| 7 — Support | Resources, competence, awareness, communication, documented information. |
| 8 — Operation | The work itself: planning, control, emergency preparedness. |
| 9 — Performance evaluation | Monitoring and measurement, internal audit, management review. |
| 10 — Improvement | Nonconformity, corrective action, continual improvement. |
Why it helps you
Because the skeleton is shared, an element built once serves several systems. Scope (4.3), policy (5.2), objectives (6.2), control of documented information (7.5), internal audit (9.2) and management review (9.3) sit in the same place in all four standards. In Optifora's data layer these shared elements are marked as shared document types; the ones specific to a single standard are kept apart.
Where the differences are
The skeleton is shared, the filling is not. ISO 45001 carries 50 clauses against 26 each for ISO 14001, ISO 9001 and ISO 50001. The gap is not arbitrary: the OH&S standard is more specific about worker participation and hazard identification.
A common mistake
Organisations that notice the shared structure sometimes merge four systems into one giant procedure. The result is a document nobody reads. The right move is to write the shared element once and link it to each standard — link, not merge.