ISO 27001 Lead Auditor vs Lead Implementer: which should you take?
The short answer
Take ISO/IEC 27001 Lead Implementer if you will build or run an information security management system (ISMS) inside a company. Take Lead Auditor if you will check whether an ISMS meets the standard, as an internal auditor, a consultant or a certification body auditor. Both credentials require the same experience: five years in total, two of them in information security, plus 300 hours of hands-on work.
What is the difference between the two?
They sit on opposite sides of the same certificate. The implementer designs and runs the system an organisation is certified on. The auditor collects evidence that the system works and reports any gaps.
Lead Implementer
- Main question: How do we meet ISO/IEC 27001?
- Typical roles: ISMS manager, CISO, security or compliance lead, GRC consultant.
- Core skills: scoping, risk assessment, choosing Annex A controls, writing policies and running the ISMS.
- Full credential: 5 years of experience, 2 of them in information security, plus 300 hours of ISMS project work.
- Without experience: Provisional Implementer.
Lead Auditor
- Main question: Does this organisation meet ISO/IEC 27001?
- Typical roles: internal auditor, certification body auditor, supplier assessor, GRC consultant.
- Core skills: audit planning, sampling evidence, interviews, writing nonconformities and closing audits, following ISO 19011.
- Full credential: 5 years of experience, 2 of them in information security, plus 300 hours of audit work.
- Without experience: Provisional Auditor.
PECB sets these requirements and can change them, so check its current certification rules before you apply.
Which one should I take first?
If you are new to ISO 27001, start with Lead Implementer. Knowing how a management system is built makes you a better auditor later, because you know where real systems usually fall short.
Go straight to Lead Auditor if your job already is auditing, for example in internal audit, an assurance team or a certification body. The same applies if your company is already certified and you need to run its internal audits, which ISO/IEC 27001 clause 9.2 requires.
Can I get certified without experience?
Yes. You can pass the exam and hold the Provisional Implementer or Provisional Auditor credential. Then you upgrade to the full Lead credential as you log the required project or audit hours. Many people take the course early in their career for exactly this reason.
Do I need both?
Consultants who both implement and audit ISMSs often hold both credentials. It shows clients you understand the full certification cycle. One rule applies, though: you should not audit a system you helped build, because independence is a core principle of auditing.
Is the 2022 version of the standard covered?
Yes. PECB's courses and exams are based on ISO/IEC 27001:2022, which has 93 controls in Annex A, down from 114 in the 2013 version. The transition period for 2013 certificates ended on 31 October 2025, so all current certifications are to the 2022 version.
How to get started
Both courses are online with Cybrainer, and the price includes the PECB certification exam:
Buying for a team? See the team training page.