ISO 27001 audit checklist: preparing for stage 1 and stage 2

Preparing for the ISO 27001 certification audit means having the performance evaluation records, a Statement of Applicability and a working ISMS ready before stage 1, then showing operational control at stage 2.

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What must be ready before an ISO 27001 stage 1 audit?

Before a certification body starts stage 1, the ISMS must already have run its performance evaluation activities and hold a Statement of Applicability. The performance evaluation covers monitoring, measurement, analysis and evaluation under clause 9.1, internal audit under clause 9.2, management review under clause 9.3, and nonconformity and corrective action under clause 10.2. The Statement of Applicability is required by clause 6.1.3 d) of ISO/IEC 27001:2022, which sits within the risk treatment process. If a customer or contract deadline is driving the timeline, work backward from these two items, because a stage 1 review that finds they have not operated will delay the whole certification.

The certification body, not DeployOpen or any consultant, sets the audit programme, the audit plan and the final certification decision. Ask your chosen body for its written audit programme and plan before stage 1 so you know what will be examined and when. No fixed number of days or weeks between stage 1 and stage 2 is supplied for this page: the body must judge whether the stage 1 findings are still valid, especially after significant changes, so confirm the gap in writing with the body rather than planning around a figure from a third party.

The checklist differs by organization. The four variables that change it most are the scope of the ISMS, the number of sites, the maturity of existing records such as risk assessments, internal audit reports and management review minutes, and whether any clause or Annex A control is still unimplemented. A small team with one site and mature records may need a short list of confirmations. A multi-site organization with thin evidence will need a longer preparation period, and any clause still in progress should be disclosed to the body early, since stage 1 is where it will be identified.

Which records and documents should you check before booking the audit?

Stage 1 starts with the documents an auditor reads first, and each one has to agree with the others. Clause 1 of ISO/IEC 27001:2022 means no clause from 4 to 10 can be excluded, so every record below will be examined, not just the Annex A controls.

Clause 4.3 scope statement

The scope defines which products, services, sites and business units the ISMS covers, and it must match the Statement of Applicability, the asset register and the network diagrams. Check that the scope is written in plain terms, that it names the boundaries and any exclusions with reasons, and that every system it mentions appears in the risk assessment. A scope that describes a smaller or larger organization than the one actually operating is among the most common early problems.

Risk assessment and treatment records

Clauses 6.1.2 and 6.1.3 require a documented information security risk assessment and a risk treatment process. Check that each risk has an identified owner, a likelihood and impact rating, a stated method, and a treatment decision with a named person accountable for it. Records that list risks without owners or dates, or that were never updated after a significant change, signal that the process is not operating.

Statement of Applicability and justifications

The Statement of Applicability records, under clause 6.1.3 d), which Annex A controls apply, which do not, and why, and how each applicable control is implemented. Check that every one of the 93 Annex A controls is addressed, that each exclusion has a justification tied to the risk assessment, and that each inclusion points to a real owner, procedure or system. An SoA that marks every control as applicable without evidence is a frequent finding during stage 1.

Documented information and version control

The standard requires documented information for the ISMS, including policies, procedures and records the organization decides are needed for effectiveness. Check that each document has an owner, a version, an approval date and a review date, that the current version is the one people use, and that superseded versions are retired. Auditors often sample a few procedures and then trace them into operation, so consistency across documents matters more than volume.

Internal audit and management review evidence

Clauses 9.2 and 9.3 require the organization to audit its own ISMS at planned intervals and to have top management review it. Check that the internal audit program covers the whole scope, that auditors were independent of what they reviewed, and that findings and management review minutes record the date, attendees, decisions and follow-up actions. Minutes that restate a template without discussing real results are a weak point in an assessment.

Nonconformity and corrective action log

Clause 10.2 requires the organization to react to nonconformities, correct them, deal with consequences and act to prevent recurrence. Check that the log records each finding with a date, source, root cause analysis, corrective action, owner and closure evidence. An empty log is not automatically a good sign: auditors will ask how internal audits and incidents feed into it, so the log should show that the process runs in practice.

How do performance evaluation records show the ISMS is running?

A certification audit looks for evidence that the ISMS has operated, not only that it has been written down. Before stage 2 the auditor expects to see a trail of dated, repeated activity under clauses 9.1, 9.2 and 9.3 and corrective action under clause 10.2. A policy that has never produced a measurement, an internal audit or a management review will read as a document set rather than a running system. Confirm each expectation below with your certification body and with the text of the standard, since the body decides how much evidence it needs for your scope and risk profile.

For clause 9.1, the records that usually matter are the defined metrics, the results collected against them, the analysis of those results and the evaluation of whether the ISMS is meeting its objectives. A useful check is whether each metric traces back to a risk in the risk treatment plan or to an objective set in clause 6.2, and whether someone recorded what they did when a result fell outside the expected range. For clause 9.2, look for an internal audit programme that covers the whole scope over time, a documented selection of auditors that shows they were not auditing their own work, and findings that each lead to a tracked action with a named owner. For clause 9.3, management review minutes should record the inputs the standard lists, such as status of actions from earlier reviews, changes in issues, nonconformities and monitoring results, and the decisions taken, with the people present.

Clause 10.2 corrective action records are where auditors look hardest at follow-through. Each nonconformity should have a recorded root cause analysis, a corrective action that addresses that cause, evidence that the action was implemented and a check that it worked. Ask yourself whether a reviewer could pick any finding from your internal audit and trace it to a closed action without help from the author. Treat these records as your own evidence of operation. They are not the certification body's conclusion that your ISMS is adequate, and the stage 1 and stage 2 reports are where that judgment appears.

What happens from the stage 1 review to the certification decision?

The two-stage initial audit moves from a documentary readiness review to a test of how the ISMS works in practice, and each step ends with a written output that tells the organization what it must still fix before the certification body can decide.

  1. Certification body issues the audit programme and plan

    Before stage 1, the certification body prepares an audit programme and an audit plan so the organization knows what will be audited and when. The organization confirms the dates, the sites and the people who will be interviewed, and checks that the planned scope matches the scope it intends to certify. The output is an agreed plan. If the scope or the sites on the plan do not match the ISMS as it actually runs, correct that now, because the plan defines what stage 1 and stage 2 will examine.

  2. Stage 1 reviews documentation and readiness

    Stage 1 is a review of documented information and of whether the ISMS is ready for a full test. The auditor checks the scope, the policies, the risk assessment and risk treatment, the Statement of Applicability, and evidence that the performance evaluation activities in clauses 9.1, 9.2 and 9.3 and the nonconformity process in clause 10.2 have run. The auditor also checks whether the organization understands its own context and the requirements of interested parties. The output is a documented stage 1 conclusion on readiness for stage 2, which is communicated to the client and lists any areas of concern that could be classified as a nonconformity during stage 2.

  3. Resolve stage 1 concerns during the interval

    The organization uses the interval between the two stages to fix the concerns raised in the stage 1 conclusions. The standard does not set a maximum length, so the certification body decides whether the stage 1 result is still valid, particularly if significant changes have happened to the ISMS, its scope or its risk picture in the meantime. Typical work includes correcting the Statement of Applicability, completing missing risk assessment records, and running an internal audit or management review that was skipped. The output is evidence, held by the organization, that each concern has been resolved. A pre-audit run in this interval does not replace the stage 1 review, and it does not count as stage 1.

  4. Stage 2 tests implementation and effectiveness

    Stage 2 tests whether the ISMS is implemented and effective. Clauses 4 to 10 are audited in full, and the Annex A controls selected in the Statement of Applicability are tested through operating evidence, not only through policy text. Auditors sample people, systems and records across the scope, and they test continuing operational control, for example whether access reviews, logs, backups and supplier checks actually happen as the documents say. Stage 2 closes with an opening and closing meeting. The output is an audit report that records conformity, observations and any nonconformities, graded as major or minor.

  5. Close nonconformities and verify corrections

    The organization responds to each nonconformity with a root cause analysis and a corrective action plan under clause 10.2, and submits the evidence to the certification body. For each major nonconformity, the certification body must verify that the correction and corrective action are complete within 6 months after the last day of stage 2. If it cannot, it must conduct another stage 2 before it can recommend certification. Minor nonconformities are handled through the corrective action process. The output is an accepted corrective action record for every finding.

  6. Certification body makes the certification decision

    The certification body reviews the stage 2 report, the corrective action evidence and the nonconformity closure, and then decides whether to grant certification. The decision is taken by people who did not carry out the audit, which is part of the certification body's impartiality controls. The output is either a certificate, issued by the certification body with its scope, dates and accreditation status, or a documented decision that certification cannot yet be granted. Confirm with the certification body before the audit how it will communicate the decision and the timeline for the certificate.

Why can a pre-audit not replace stage 1?

A pre-audit is allowed before stage 1, but it cannot be used as the stage 1 audit. European Accreditation FAQ 48.11 (September 2024) records IAF Technical Committee consensus that pre-audits before stage 1 are acceptable if impartiality is not compromised, and that no pre-audit may sit between stage 1 and stage 2. The difference matters because stage 1 is the certification body's own formal readiness review. It ends with documented conclusions on readiness for stage 2, including areas of concern that could become a nonconformity, and the client must receive those conclusions. A consultant's readiness review or a pre-audit by another party produces none of that, so it cannot stand in for the certification body's review or the conclusions that follow from it.

Use a pre-audit for what it does well. A readiness review by an independent party can test whether the performance evaluation records under clauses 9.1 to 9.3 exist and are current, whether the Statement of Applicability matches the risk treatment decisions under clause 6.1.3, and whether the organization can show a complete internal audit and corrective action trail under clause 10.2. It can also surface gaps while the organization still has time to close them. It cannot promise an outcome, and it cannot tell the organization whether the certification body will accept its scope or its evidence. The organization owns the decision to book stage 1, sets the date and chooses who prepares the evidence. Keep the pre-audit provider separate from the body that will certify you, because a provider that is also the certifier risks an impartiality conflict.

Before you book, ask the certification body in writing what it will and will not count. Confirm whether it accepts an earlier readiness review as evidence, whether it needs its own stage 1 scheduled regardless of any pre-audit, and how long it expects between stage 1 and stage 2. European Accreditation FAQ 49.3 (March 2025) sets no maximum interval, so the body must judge whether the stage 1 result still holds, especially after significant changes. If a pre-audit reveals large changes, ask whether the stage 1 conclusions remain valid. Keep the written answers with your audit file so the planning decision is documented.

What does stage 2 test in the management system and the Annex A controls?

Clause 1 of ISO/IEC 27001:2022 states that an organization claiming conformity may not exclude any requirement in clauses 4 to 10, so the assessor audits every one of them. These clauses cover the context of the organization, leadership and commitment, planning, support, operation, performance evaluation and improvement. Stage 2 is where the assessor confirms that the management system is implemented and running, not just described in a manual.

  • Context and scope (clauses 4.1 to 4.4): Records showing how the organization determined its internal and external issues, interested parties and the boundary of the ISMS.
  • Leadership (clause 5): Evidence that top management approved the policy, assigned roles and responsibilities, and acted on the results of management review.
  • Planning and support (clauses 6 and 7): Risk assessment and risk treatment records, objectives with plans to meet them, competence records and documented information control.
  • Operation and performance evaluation (clauses 8 and 9): Records of risk assessments run as planned, monitoring results, internal audit reports and management review minutes.
  • Improvement (clause 10): Nonconformity records, root cause analysis and corrective actions closed with evidence of effectiveness.

Check that each clause has a named owner and at least one record from the period you are asking the assessor to sample.

Which readiness route fits your organization?

This table compares three ways to prepare before a certification audit: an internal self-check, an independent readiness review, and a formal pre-audit by a certification body. Read each row against your own records and deadline, and note that none of the three replaces the stage 1 audit.

OptionWhat it coversWho owns the outputWhen it fits
Internal self-checkClause-by-clause walk through clauses 4 to 10, the Statement of Applicability against the risk treatment decisions, and records from the clause 9 and 10.2 activitiesThe organization, which decides what to fix and keeps the recordA mature ISMS with recent internal audits and management review minutes, where the team can test its own records honestly
Independent readiness reviewSample testing of evidence for each clause and selected Annex A controls, a gap list, and advice on how the records will be read at auditThe organization owns the findings and fixes. The reviewer owns only its own report and must stay independent of the certification bodyA first certification with unclear records, or a team that has never been audited against clauses 4 to 10
Formal pre-audit by a certification bodyA preliminary visit the certification body may offer, limited to what it can accept under its impartiality rulesThe certification body issues its own notes, but the output is not a stage 1 result and cannot count as oneOnly where the body offers it and the organization wants early feedback. Confirm its fee and terms in writing
What none of the three replacesStage 1 documented review of readiness and the stage 2 test of operationThe certification body alone decides readiness for stage 2 and issues the certificatePlan the stage 1 audit in every case, with an interval to resolve concerns
Questions to ask each providerAsk what evidence the output includes: sampled records, dated findings, owner for each action, and whether it can be shown to the certification bodyConfirm in writing who keeps the report and whether it can be sharedAsk before booking so the chosen route matches your records and deadline

Who prepares the evidence and who issues the decision?

Your organization owns the information security management system and everything the certification body will test. The people accountable for the ISMS must make the decisions that the audit examines: which risks matter, which treatment options are chosen, and whether the Statement of Applicability reflects reality. Nobody else can sign those decisions on your behalf, and an auditor will ask who made them and when.

  • Risk decisions: Management approves the risk assessment method, accepts residual risk and decides which Annex A controls apply and why.
  • Statement of Applicability approval: A named owner approves the document under clause 6.1.3 and keeps it current as controls change.
  • Management review: Leadership holds and records the review that clause 9.3 requires, with actions and decisions written down.
  • Control operators: Staff who run each control, such as access reviews or backups, produce the records that prove the control operated.
  • Corrective action: Your team investigates findings and closes nonconformities under clause 10.2.

Ask yourself whether each control has a named owner who can explain it to an auditor without a consultant in the room.

What usually delays stage 1 or sends the project back to stage 2?

Most stage 1 and stage 2 setbacks trace back to records that do not match what is running in the organization. The cards below cover the pitfalls auditors meet most often and the checks that catch them before the audit team arrives.

Statement of Applicability without justifications

The Statement of Applicability under clause 6.1.3 d) must list every Annex A control, state whether it applies, and give reasons for inclusion and exclusion. A list of ticked controls with no justification forces the auditor to reopen the risk treatment decisions behind it. Before stage 1, check that each control row links to a risk treatment decision and a named owner, and that exclusions cite the risk assessment rather than convenience.

Scope that does not match reality

The clause 4.3 scope statement must describe the sites, systems, services and people the ISMS actually covers. Scopes drawn from an old org chart or a marketing description often omit a data center, a cloud account or a contractor team that processes customer data. Walk the proposed boundary against the asset inventory and network diagrams, and confirm that every excluded location or service has a documented reason.

Internal audit and management review not recorded

Clauses 9.2 and 9.3 require internal audits and management reviews to take place, and the auditor will ask for records of both. Reviews held in meetings with no minutes, agendas, attendees or decisions are treated as if they did not happen. Schedule the internal audit before stage 1, hold a management review that covers the required inputs, and keep signed minutes that record actions and owners.

Controls on paper without operating evidence

A policy that exists but has no trace of use fails the stage 2 test, because stage 2 checks whether controls operate in practice. Examples include access reviews never performed, backups never restored, or vulnerability scans with no follow-up tickets. For each control in the Statement of Applicability, collect a dated record from the period before the audit, such as a review sign-off, a log extract, a ticket or a test result.

Open majors that cannot be closed in time

Under ISO/IEC 17021-1, if the certification body cannot verify corrections and corrective actions for every major nonconformity within 6 months after the last day of stage 2, it must conduct another stage 2 before recommending certification. Treat any major finding as a deadline with an owner, a root cause analysis and verification evidence. Plan the corrective action work so that verification can happen inside that window.

Significant changes between stages 1 and 2

The interval between stage 1 and stage 2 exists so the organization can resolve stage 1 concerns, and the certification body must judge whether the stage 1 result still holds after significant changes. A new cloud provider, a reorganized team, or a merged business unit can make the stage 1 review out of date. Log every change in that period, record its effect on scope and risk assessment, and tell the certification body early so it can decide whether stage 1 needs repeating.

What do buyers ask before stage 1 and stage 2?

How long must the gap between stage 1 and stage 2 be?

No maximum is set. ISO/IEC 17021-1 requires an interval between the two stages so the client can resolve the concerns raised in stage 1, but the certification body decides whether that interval is long enough. European Accreditation FAQ 49.3 (March 2025) says the body must judge whether the stage 1 result is still valid, especially after significant changes to the ISMS or the organization. Ask the body in writing how it will assess the gap, which stage 1 findings it expects you to close first, and whether it will need a repeat of stage 1 if your changes are large. Plan the interval around closing concerns, not around a calendar target.

Can a consultant prepare us without the certification body being involved?

Yes. Preparation is the organization's work, and an outside consultant or implementation partner can help build the ISMS, the Statement of Applicability, the risk treatment records and the evidence, without any involvement from the certification body. The audit itself stays separate. The body plans and conducts the audit, and only it issues the certificate. Keep the preparer independent of the audit decisions: the people who designed the controls should not also be the people who certify that they work. Confirm with the body what it accepts about pre-audit preparation and who may attend the audit.

Can a pre-audit replace stage 1?

No. A pre-audit is an optional review before stage 1 and cannot be used as the stage 1 audit. European Accreditation FAQ 48.11 (September 2024) records the IAF Technical Committee consensus that pre-audits before stage 1 are acceptable if impartiality is not compromised, but that they are not acceptable between stage 1 and stage 2. Stage 1 is the formal review of your documented ISMS and readiness for stage 2, and it produces documented conclusions the body must communicate to you. A pre-audit can help you find gaps early, but the certification body still has to run its own stage 1.

What must we provide during stage 2?

Stage 2 tests whether the ISMS is implemented and operating, so the organization must make people, records and systems available. Typically this includes:

  • Staff and control owners who can explain their processes and show the evidence for their controls.
  • Operational records such as access reviews, change logs, incident tickets, training records and supplier reviews.
  • Read access to the systems that hold the evidence, such as logging, ticketing or configuration tools, with accounts set up in advance.
  • Management review and internal audit records, and the register of nonconformities and corrective actions.

Agree the audit plan and the interviewees with the body beforehand. The exact sampling is decided by the auditor.

What happens if a major nonconformity is still open after stage 2?

The body must verify your corrections and corrective actions for every major nonconformity within 6 months after the last day of stage 2. If it cannot verify them in that window, it must conduct another stage 2 before it can recommend certification. European Accreditation FAQ 36.14 cites this rule from ISO/IEC 17021-1. Minor nonconformities follow a separate path, so check with the body how it will handle them. Treat the 6-month limit as a hard deadline in your plan, and schedule the corrective action work so the evidence exists and can be checked before it runs out.

Can we run the readiness work entirely in-house?

Yes, if your team has the capacity and the skills to run the performance evaluation activities, maintain the Statement of Applicability and collect evidence, and if the people doing that work are independent of the audit decisions. Many organizations split the work: internal staff own the controls and records, while an outside party reviews the ISMS and helps prepare the evidence. The main in-house risks are time, lack of an internal auditor who understands clause 9.2, and self-review blind spots. Estimate the internal effort with your own plan, and ask any outside partner for a written scope that lists what they deliver and what stays with your staff.

Do we have to show every clause and every Annex A control at stage 2?

Every clause from 4 to 10 is audited, because clause 1 of ISO/IEC 27001:2022 does not allow an organization claiming conformity to exclude any of them. The Annex A controls are handled differently: you decide which apply through risk treatment and record the decisions in the Statement of Applicability under clause 6.1.3. Auditors check that your selection follows from the risk assessment and that the controls you claim are implemented and working. Excluded controls need a reason in the Statement of Applicability, and the auditor will test that reason too.

How DeployOpen prepares systems and evidence for stage 1 and stage 2

DeployOpen plans, implements and documents self-hosted open-source platforms inside your own infrastructure, so the systems and records an auditor samples already exist and are current before stage 1. We prepare the evidence and the readiness material, while your organization owns its controls and an independent certification body performs both audit stages.

How we scope

  • Engagements are fixed-scope, with the ISMS boundary, sites, systems and deliverables agreed in writing before work starts.
  • We confirm which Statement of Applicability entries map to platforms we will build, and which remain with your teams.
  • We agree the evidence list for performance evaluation records and the stage 1 document pack with you in advance.

How we build

  • We configure the self-hosted platforms in your cloud accounts or data centers so that access, logging and backup records are produced automatically.
  • We run internal audit and management review inputs as dated, reviewable records, so clauses 9.2 and 9.3 have real history behind them.
  • We test the technical controls named in your Statement of Applicability and record the results, including gaps and the corrective actions raised.

How we hand over

  • You receive documented procedures, configuration records and an evidence index that maps each control to where its proof is stored.
  • We prepare a readiness walkthrough so your staff can explain each control and show its evidence during stage 2 sampling.
  • Our written handover lists open nonconformity risks and corrective actions so you can close them within the interval before stage 2.

How we support

  • Ongoing support, upgrades and continuous testing are available as retainers after the initial scope is delivered.
  • Support can cover evidence collection for surveillance audits, which must include continuing operational control, not only documents.
  • Certification decisions, audit reports and certificates always come from your independent certification body, not from DeployOpen.

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