Certification · ISO/IEC 27001 lead auditor and implementer certification · Released October 2026

ISO/IEC 27001 Lead Auditor & Implementer Practice Guide by Kai London

This practice guide takes you through the knowledge ISO/IEC 27001 lead auditor and implementer certification expects, area by area, in clear language — with worked examples, exam tips and practice questions so you can check your progress as you go.

What the book covers

The standard in practice

Clauses 4 to 10 explained with worked examples.

Annex A controls

The 2022 control set, how to apply it and the Statement of Applicability.

Risk assessment

Methods that produce defensible risk treatment decisions.

Implementation roadmap

Planning, documentation and embedding the ISMS.

Audit technique

Planning, sampling, interviewing and writing findings.

Practice and review

End-of-chapter questions with explanations, plus a final review checklist.

This is an independent study aid. It is not affiliated with, sponsored or endorsed by ISO, IEC or any certification body; exam names are trademarks of their owners. Always check the current official exam outline.

ISO/IEC 27001ISMSAuditAnnex A

Who it is for

ISMS implementers, internal and external auditors, compliance managers and candidates for lead implementer or lead auditor certification.

About the author

Professor Kai London — CISSP, CISM.

An internationally recognised cybersecurity executive, board advisor and Founder & CEO of Quantum AI Systems Security LLC, writing at the convergence of AI, governance and operational resilience. Honorary Professor and Researcher at UCL.