ISO 27001 vs 27002 vs 27003: where do controls and guidance split?

TL;DR: ISO 27001 is the certifiable ISMS standard, ISO 27002 expands Annex A into control guidance, and ISO 27003 explains how to plan and design an ISMS, according to StrongDM. The practical issue is not choosing one standard over another, but aligning certification, control selection, and implementation planning into a single governance path.

NHIMG editorial — based on content published by StrongDM: ISO 27001 vs. 27002 vs. 27003: What’s the Difference?

By the numbers:

• 114 security controls divided into 14 control sets
• Cyber incidents are among the top risks for businesses in 2022

Questions worth separating out

Q: How should organisations decide when to use ISO 27001 versus ISO 27002?

A: Use ISO 27001 when you need the certifiable ISMS baseline, the risk treatment framework, and the management system requirements.

Q: Why do access control and audit logging matter so much in ISO compliance programmes?

A: Because they are among the clearest ways to show that security policy is operating as a managed system rather than a paper exercise.

Q: What breaks when teams treat ISO 27002 as a certification standard?

A: Teams misread guidance as proof of compliance and confuse implementation detail with certification evidence.

Practitioner guidance

• Separate certification scope from control guidance Document which activities sit under ISO 27001 certification, which are supported by ISO 27002 guidance, and which belong in the ISO 27003 implementation plan.
• Map access governance to Annex A controls Link identity approvals, privileged access workflows, secrets handling, and audit logging to the relevant Annex A controls so evidence can be traced from policy to operation.
• Use the implementation plan to sequence ownership Assign explicit owners for risk assessment, control design, evidence collection, and review cadence before the programme reaches audit readiness.

What's in the full article

StrongDM's full article covers the operational detail this post intentionally leaves for the source:

• How StrongDM maps access management to ISO 27001-oriented compliance workflows across infrastructure.
• The article's explanation of how its proxy model supports segregation of duties, JIT access, and audit logging.
• The specific way StrongDM frames credential storage and network segmentation as compliance-enabling controls.
• The article's own comparison of when to use ISO 27001, ISO 27002, and ISO 27003 in a programme rollout.

👉 Read StrongDM's guide to ISO 27001, 27002, and 27003 differences →

ISO 27001 vs 27002 vs 27003: where do controls and guidance split?

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