ISO 27001 Implementation Checklist: From Gap Analysis to Certification (2025)

ISO/IEC 27001:2022 is the global standard for Information Security Management Systems (ISMS). This checklist walks you through every phase - from initial gap analysis to the moment you receive your certificate.

Pre-Implementation Phase

• Secure top management commitment and budget approval
• Define the ISMS scope (which sites, systems, data, processes)
• Appoint an ISMS owner / information security manager
• Run a gap analysis against ISO 27001:2022
• Build the project plan with milestones and owners

Documentation Phase

• Draft the Information Security Policy
• Build the risk assessment methodology (aligned to ISO 27005 or your chosen approach)
• Conduct the risk assessment - identify assets, threats, vulnerabilities, likelihood and impact
• Produce the risk treatment plan
• Complete the Statement of Applicability (SoA) for all 93 Annex A controls (2022 edition)
• Write 20+ policies: access control, cryptography, BYOD, supplier, incident, BCP, HR, physical, etc.
• Create procedures for each applicable control

Implementation Phase

• Deploy the 93 Annex A controls per the SoA
• Roll out security awareness training to all staff
• Implement technical controls: firewalls, encryption, MFA, DLP, SIEM
• Set up incident management process and test it
• Establish KPIs and metrics for ISMS performance

Audit Phase

• Run a full internal audit (ISO 19011 aligned)
• Hold a management review meeting with top management
• Close all nonconformities and CAPAs
• Stage 1 audit by certification body (documentation review)
• Stage 2 audit by certification body (on-site/remote implementation audit)
• Receive your ISO 27001 certificate

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