What is an integrated management system (IMS)?
An integrated management system runs two or more management-system standards as one, instead of maintaining separate, overlapping systems. In practice that usually means combining ISO 9001, ISO 14001 and ISO 45001.
Why it works: the shared structure
ISO's management-system standards are built on a common Harmonized Structure — the same top-level clauses for context, leadership, planning, support, operation, performance evaluation and improvement. Because the skeleton is identical, the parts that repeat across quality, environment and safety can be run once. See how the three compare in ISO 9001 vs 14001 vs 45001.
What you integrate
The common machinery becomes shared: one document and policy control process, one internal audit and corrective-action programme, one competence approach, one management review that looks at quality, environment and safety together. What stays separate is the subject-specific content — quality requirements, environmental aspects, safety hazards.
The benefits — and the catch
Integration removes duplicated procedures, prevents the conflicting versions that appear when three systems drift apart, and gives leadership a single picture. The catch is that it only works if the shared processes are genuinely shared and kept current in one place — three "integrated" systems that are really three spreadsheets in a trench coat give you the worst of both. That single, live source of evidence is exactly what an ISO compliance system provides.
Run one system, not three
Complys holds the shared documents, audits, actions and competence records once, for ISO 9001, 14001 and 45001 together.
ISO compliance software →FAQs
What does an integrated management system combine?
Most often ISO 9001 (quality), ISO 14001 (environment) and ISO 45001 (health & safety), but an IMS can combine any management-system standards that share the Harmonized Structure. You integrate the common parts and keep the subject-specific requirements of each.
Why integrate rather than run separate systems?
Because the standards share so much — one document-control process, one internal-audit programme, one corrective-action loop, one management review — integrating removes duplicated effort, avoids conflicting procedures, and gives leadership a single view instead of three.
Can you be certified to an integrated system?
You are still certified to each standard, but a certification body can run a single combined audit against the integrated system, which is usually more efficient than three separate assessments.
Related: ISO 9001 vs 14001 vs 45001, ISO internal audit checklist, and preparing for a certification audit.