The Harmonized Structure (HS) and what it means for the next ISO 9001
The Harmonized Structure is the common skeleton behind every modern ISO management system standard. Here's what it is, why it exists, and how it shapes ISO 9001:2026.
If you have ever opened ISO 9001, ISO 14001, ISO 45001, ISO 27001, and ISO/IEC 42001 side by side, you will have noticed they share the same ten-clause skeleton. That skeleton has a name: the Harmonized Structure (HS), formerly known as Annex SL, and it is the quiet revolution behind the modern era of ISO management system standards.
What the HS is
A common high-level structure, identical core text, and shared terms and definitions that ISO requires every new and revised management system standard to follow. It guarantees that any two MSS standards will be structurally and conceptually compatible.
The 10 clauses
- 1. Scope
- 2. Normative references
- 3. Terms and definitions
- 4. Context of the organization
- 5. Leadership
- 6. Planning
- 7. Support
- 8. Operation
- 9. Performance evaluation
- 10. Improvement
Why it exists
- To make integrated management systems genuinely possible (see 9001 + 14001 + 45001)
- To reduce duplication for organizations certified to multiple standards
- To make audits, training, and certification more consistent across disciplines
- To future-proof the system as new standards emerge (AI, climate, information security)
What it means for ISO 9001:2026
ISO 9001:2026 will retain the HS skeleton — that part is non-negotiable. What will evolve is the quality-specific content layered on top: sharper context requirements, explicit treatment of climate-related issues (already added by amendment in 2024), stronger digital and risk-based language, and clearer expectations around organizational knowledge and supply chain control.
Because the structure is stable, organizations that already have a mature ISO 9001:2015 system will not need to re-architect anything. The transition is about updating content within a familiar frame, not rebuilding the frame itself.
“The Harmonized Structure is the reason a modern QMS can absorb new standards without collapsing under the weight of duplication. It is the most underappreciated decision ISO ever made.”