A phase-by-phase guide from initial gap assessment through Statement of Applicability, control implementation, internal audit and certification body audit.
ISO 27001 requires an Information Security Management System (ISMS) — a structured, risk-based approach to managing security across people, processes and technology, not just a checklist of technical controls.
The standard requires you to identify risks, decide how to treat them, implement proportional controls from Annex A, and continually monitor and improve the system over time.
Phase 1 — Gap Assessment: Evaluate current controls against ISO 27001 Annex A to understand your starting point.
Phase 2 — Scope & Statement of Applicability (SoA): Define what's in scope for certification and document which of the 93 Annex A controls apply to your organization and why.
Phase 3 — Policy & Control Implementation: Build the required policies, risk treatment plans, and implement technical and procedural controls.
Phase 4 — Internal Audit: Conduct an internal audit to validate readiness and catch gaps before the external audit does.
Phase 5 — Certification Audit: Undergo Stage 1 (documentation review) and Stage 2 (implementation evidence) audits with an accredited certification body.
Phase 6 — Continuous Improvement: Maintain the ISMS through annual surveillance audits and a 3-year recertification cycle.
The most common delay isn't technical control implementation — it's building genuine evidence of operation. Auditors want to see controls working over time (access reviews actually happening, incidents actually being logged), not just policies that exist on paper.
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