Preparation guide
ISO 27001 Lead Implementer study plan
Use the source-backed decision map, original scenario and study sequence before practising.
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ISO/IEC 27001 Lead Implementerexam preparation
The ISO/IEC 27001 Lead Implementer exam is a three-hour PECB certification examination for professionals who plan, implement, maintain and improve an information security management system. It contains 80 multiple-choice questions across seven weighted competency domains and has a 70% pass mark. Each question has three options: one correct answer and two distractors. The exam is open book, with three permitted types of reference material.
- Questions
- 80
- Pass mark
- 70%
- Domains
- 7
- Format
- Open book
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Results analysed with Aeges AI
Complete a ISO/IEC 27001 Lead Implementer practice session, then use Aeges AI learning intelligence to understand how your submitted answers performed across the qualification. For this exam, the analysis distinguishes ISMS planning, implementation, monitoring, improvement and certification-audit preparation signals.
See how Aeges AI works- Competency map
- 7 domains
- Learning signal
- Relative strength and gap
- Next decision
- Revision priority
Written by Harry Sidhu, ISO 27001 Lead Implementer · Director and Principal Consultant, Aegentra. Facts are checked against the published sources listed below.
Published exam facts
What is on the ISO/IEC 27001 Lead Implementer exam?
These facts come from PECB’s published documents. Where PECB does not publish a detail, this page says so instead of repeating an unsupported figure.
- Questions
- 80
- Pass mark
- 70%
- Duration
- 180 minutes
Stand-alone and scenario-based multiple choice.
Equivalent to 56 correct answers from 80 questions.
Open-book materials
What you may bring- ISO standardA hard copy of the ISO/IEC 27001 standard
- Course materialsTraining course materials, through the PECB Exams app and/or printed
- Personal notesPersonal notes taken during the training course, through the PECB Exams app and/or printed
Retakes: PECB sets no overall limit on retakes but applies waiting periods between attempts. Training completed through a PECB partner includes the first exam attempt and one free retake within 12 months.
Your revision map
How is the exam weighted across domains?
The published handbook allocates all 80 questions across 7 competency domains. The simulation below follows that allocation.
- Domain 118.75%15 questions
Fundamental principles and concepts of an information security management system
Information and assets, confidentiality, integrity and availability, threats, vulnerabilities and risks, legal and contractual obligations, and preventive, detective and corrective control classifications. Fifteen questions at comprehension, application and analysis level.
- Domain 215%12 questions
Information security management system requirements
Selecting, designing, documenting and implementing the 93 Annex A controls, using ISO/IEC 27002 guidance and understanding the organisational, people, physical and technological control groups. Twelve questions at comprehension, application and analysis level.
- Domain 322.5%18 questions
Planning of an ISMS implementation based on ISO/IEC 27001
Context, interested parties, scope, policy, implementation planning, resources, objectives, gap analysis, information security risk assessment and treatment, and the Statement of Applicability. Eighteen evaluation-level questions make this the largest domain.
- Domain 417.5%14 questions
Implementation of an ISMS based on ISO/IEC 27001
Documented-information lifecycle, operational processes, competence, awareness and communication, cloud and emerging technologies, incident management, business continuity and disaster recovery. Fourteen evaluation-level questions.
- Domain 512.5%10 questions
Monitoring and measurement of an ISMS based on ISO/IEC 27001
Monitoring ISMS objectives and effectiveness, meaningful measures and indicators, the internal audit programme, nonconformity reporting and management review. Ten questions at comprehension, application and analysis level.
- Domain 67.5%6 questions
Continual improvement of an ISMS based on ISO/IEC 27001
Treating nonconformities, determining root causes, designing and verifying corrective actions, monitoring change factors and continually improving ISMS suitability, adequacy and effectiveness. Six evaluation-level questions.
- Domain 76.25%5 questions
Preparation for an ISMS certification audit
Selecting a certification body, evidence-based auditing, stage 1 and stage 2 activities, audit readiness, findings, follow-up, surveillance and recertification. Five questions at comprehension, application and analysis level.
Question structure
What kinds of questions are asked?
Expect a mix of direct knowledge checks and applied scenarios. The emphasis is on choosing the action a competent lead implementer would take.
- Stand-alone multiple choice
- Independent questions with all required context in the stem. Each presents three options: one keyed response and two distractors. These commonly test terminology, control purpose and management-system relationships.
- Scenario-based multiple choice
- A written organisational scenario supports a group of five related questions. Candidates must apply concepts, analyse evidence and choose the action an effective ISMS implementer would take.
- Evaluation-level decisions
- PECB assigns 37 of 80 questions to evaluation. Domains 3, 4 and 6 require candidates to judge competing actions, prioritise work and defend an implementation decision rather than merely recall a clause.
Study strategy
How should you sequence your study?
The exam is not evenly distributed. Planning and implementation are 32 of the 80 questions, and both are assessed at evaluation level. Study the system as a working implementation, not as a list of clauses.
- Map clauses 4 to 10 before memorising Annex A. Write one sentence for the purpose of each clause and identify the evidence an auditor would expect. This gives every later control and document a place in the management system.
- Build one risk assessment and treatment trail end to end. Start with an asset and business consequence, identify a threat and vulnerability, apply the risk criteria, choose treatment and connect the selected control to the Statement of Applicability. Most domain 3 questions test this chain.
- Learn the 93 controls by four themes, not by number. Organisational, people, physical and technological groupings are easier to retrieve under time pressure. For every control, know the risk it addresses and one form of operating evidence.
- Practise implementation decisions. Draft a scope, policy, measurable objective, communication plan and document-control workflow for one imagined organisation. Evaluation questions reward the next defensible action, not a memorised definition.
- Finish with assurance and improvement. Internal audit, management review, nonconformity, corrective action, stage 1 and stage 2 are smaller domains but provide reliable marks once their purposes are separated clearly.
Create a short open-book index while you study. Point to the clause, control or note you would need; do not plan to search the entire standard during a three-hour examination.
Where do candidates actually lose marks?
- Treating Annex A as a mandatory checklist. Controls are selected through risk treatment and compared with the Annex A reference set. Applicability and exclusions must be justified in the Statement of Applicability.
- Confusing a risk with a vulnerability. A vulnerability is a weakness, a threat can exploit it, and risk combines uncertainty with consequences for information security objectives. Scenario questions deliberately mix them.
- Writing a scope around convenient technology. Scope must reflect context, interested parties, interfaces, dependencies and organisational, physical and technological boundaries. Excluding an awkward supplier does not remove its effect on the ISMS.
- Choosing controls before agreeing risk criteria. Without consistent likelihood, consequence and acceptance criteria, treatment decisions cannot be compared or approved coherently.
- Counting activity instead of measuring effectiveness. Training attendance, tickets closed and policies published are outputs. Monitoring should show whether objectives and controls produce the intended security outcome.
- Correcting the symptom and calling it corrective action. Correction deals with the detected issue. Corrective action addresses its cause and must be reviewed for effectiveness.
- Preparing evidence only for stage 2. Stage 1 tests scope, documented system and readiness. Weak document control, an immature internal audit programme or an incomplete management review can stop the certification process early.
Candidate questions
ISO/IEC 27001 Lead Implementer exam FAQs
Direct answers about time, materials, retakes, credentials and the knowledge expected before exam day.
How long is the ISO/IEC 27001 Lead Implementer exam?
The examination lasts three hours. PECB publishes the duration in its current ISO/IEC 27001 Lead Implementer brochure. Candidates sitting a Lead exam in a language other than their mother tongue may be eligible for additional time under PECB examination rules.
How many questions are in the ISO 27001 Lead Implementer exam?
The current PECB multiple-choice examination contains 80 questions. Domain 3 is the largest with 18 questions, followed by domain 1 with 15 and domain 4 with 14. The remaining domains contain 12, 10, 6 and 5 questions respectively.
What can you use in the open-book exam?
PECB permits a hard copy of ISO/IEC 27001, the training course materials and personal notes taken during the course. Course materials and notes may be printed or accessed through the PECB Exams app. Open book does not mean unrestricted internet access.
What score do you need to pass?
The pass mark is 70%, which is equivalent to 56 correct answers out of 80. Because question counts follow the published domain weights, planning and implementation together account for 32 questions and should receive the largest share of revision time.
Does passing award the Lead Implementer credential immediately?
No. Passing satisfies the examination requirement, but the credential level depends on verified professional and project experience. Lead Implementer requires five years of professional experience, including two years in information security management, plus 300 hours of ISMS project activities and acceptance of the PECB Code of Ethics.
How is ISO/IEC 27001 different from ISO/IEC 27002?
ISO/IEC 27001 contains the certifiable requirements for an information security management system and includes the Annex A reference controls. ISO/IEC 27002 supplies detailed implementation guidance for information security controls. An organisation is certified against ISO/IEC 27001, not ISO/IEC 27002.
Do you need cybersecurity experience before taking the course?
PECB states that participants should have general knowledge of ISMS concepts and ISO/IEC 27001. A technical security background helps with Annex A, but the examination also requires management-system planning, risk, documentation, monitoring, corrective action and certification-readiness skills.
What is the most important domain to study?
Domain 3, planning the ISMS implementation, is the largest at 22.5% and is assessed at evaluation level. It covers context, scope, objectives, implementation planning, risk assessment, risk treatment and the Statement of Applicability. Domain 4 is next at 17.5%.
What happens if you fail the examination?
PECB does not impose an overall limit on the number of retakes, although waiting periods apply. Candidates whose training was purchased through a PECB partner normally receive the first attempt and one free retake, which must be used within 12 months.
Aegentra Academy and advisory
From exam knowledge to an operating ISMS
Connect the qualification to official training, implementation work, independent audit and maintained ISO/IEC 27001 resources.
Real projects require a defensible scope, risk assessment, Statement of Applicability, operating controls and independent audit evidence. Downloadable templates and worked material are maintained in the Aegentra Academy Library rather than duplicated on Aegentra Labs.
Official trainingISO 27001 Lead Implementer coursePECB course materials, examination access and two attempts through Aegentra Academy.Implementation serviceBuild an ISO 27001 ISMSScope, risk treatment, controls and evidence designed around the organisation that will operate them.Independent auditTest the ISMS before certificationClause 9.2 internal audit, evidence sampling, findings and corrective-action close-out.Aegentra Academy LibraryDownload ISO 27001 templates and worked materialMaintained templates, implementation documents, mappings and downloadable resources.