The audit team’s approach is in line with recommended auditing practices, making option A the correct answer. ISO management system audits, including ISO/IEC 27001 audits, are designed to provide reasonable assurance, not absolute assurance, that the management system conforms to the standard requirements. This principle is explicitly supported by ISO 19011 and ISO/IEC 17021-1.

In the scenario, the audit team assessed conformity by reviewing key processes, questioning responsible personnel, examining representative evidence, and evaluating control effectiveness. Although access to IT systems was limited, the auditors compensated by gathering sufficient and appropriate evidence through alternative means. This approach reflects the reality of auditing complex environments, particularly those involving third-party service providers.

Option B is incorrect because ISO standards do not require auditors to assess every process in full detail. Audits are sample-based by design. Expecting a complete, exhaustive assessment of each process would be impractical and inconsistent with audit principles. Option C is incorrect because assessing the ISMS as a whole is not merely an efficiency-driven decision; it is an accepted and intentional audit approach aimed at evaluating system-level effectiveness.

Therefore, obtaining reasonable assurance through a structured, evidence-based approach confirms that the audit team acted in accordance with recommended audit practices.

A document review is a process of examining the documented information related to the management system before the on-site audit activities. The purpose of a document review is to: 12

Determine the conformity of the management system, as far as documented, with audit criteria, i.e., to check whether the documents are consistent, complete, and compliant with the requirements of ISO/IEC 27001 and any other applicable standards or regulations.

Gather information to support the on-site audit activities, i.e., to identify the scope, objectives, processes, controls, risks, and opportunities of the management system, and to plan the audit methods, techniques, and resources accordingly.

The other statements are not accurate, because:

A document review does not reveal or decide about the conformity or nonconformity of the management system as a whole, but only of the documented information. The conformity or nonconformity of the management system is determined by the on-site audit activities, which include interviews, observations, and tests12

A document review does not gather evidence or findings to support the audit report or process, but information to support the on-site audit activities. The evidence or findings are collected during the on-site audit activities, which are then documented and reported12

A document review does not detect any nonconformity of the management system, if documented, but determines the conformity of the documented information. The nonconformity of the management system is detected by the on-site audit activities, which evaluate the performance and effectiveness of the management system12

A document review does not identify information to support the audit plan, but gathers information to support the on-site audit activities. The audit plan is prepared before the document review, based on the audit scope, objectives, criteria, and program. The document review is part of the audit plan implementation12

A checklist is a tool that helps auditors to collect and verify information relevant to the audit objectives and scope. It can provide the following advantages:

Ensuring relevant audit trails are followed: A checklist can help auditors to identify and trace the sources of evidence that support the conformity or nonconformity of the audited criteria. It can also help auditors to avoid missing or overlooking any important aspects of the audit.

Ensuring the audit plan is implemented: A checklist can help auditors to follow and fulfil the audit plan, which describes the arrangements and details of the audit, such as the objectives, scope, criteria, schedule, roles, and responsibilities. It can also help auditors to manage their time and resources effectively and efficiently.

The other options are not advantages of using a checklist, but rather:

Using the same checklist for every audit without review: This is a disadvantage of using a checklist, as it can lead to a rigid and ineffective audit approach. A checklist should be tailored and adapted to each specific audit, taking into account the context, risks, and changes of the auditee and the audit criteria. A checklist should also be reviewed and updated periodically to ensure its validity and relevance.

Restricting interviews to nominated parties: This is a disadvantage of using a checklist, as it can limit the scope and depth of the audit. A checklist should not prevent auditors from interviewing other relevant parties or sources of information that may provide valuable evidence or insights for the audit. A checklist should be used as a guide, not as a constraint.

Reducing audit duration: This is not necessarily an advantage of using a checklist, as it depends on various factors, such as the complexity, size, and maturity of the auditee’s ISMS, the availability and quality of evidence, the competence and experience of the auditors, and the level of cooperation and communication between the auditors and the auditee. A checklist may help reduce audit duration by improving efficiency and organization, but it may also increase audit duration by requiring more evidence or verification.

Not varying from the checklist when necessary: This is a disadvantage of using a checklist, as it can result in a superficial or incomplete audit. A checklist should not prevent auditors from exploring or investigating any issues or concerns that arise during the audit, even if they are not included in the checklist. A checklist should be used as a support, not as a substitute.

Comprehensive and Detailed In-Depth Explanation:

C. Correct Answer:

Data test techniques simulate transactions within financial software to verify logic, calculations, and programmed controls.

ISO 19011:2018 recognizes CAATs as audit tools that validate data processing integrity.

A. Incorrect:

Plotting and cartography software is used for geospatial analysis, not financial transaction testing.

B. Incorrect:

Utility software supports general IT functions but does not conduct audit simulations.

Relevant Standard Reference:

ISO 19011:2018 Clause 6.4.10 (Use of CAATs in Auditing)

Comprehensive and Detailed In-Depth Explanation:

C. Incorrect Statement – Not all vulnerabilities require immediate remediation. Risk assessment determines whether controls are necessary. Some vulnerabilities pose low risks and may not need urgent fixes.

A. Correct Statement – Vulnerabilities can be intrinsic (inherent flaws) or extrinsic (caused by external misconfigurations).

B. Correct Statement – Threats must exploit vulnerabilities to cause harm.

This aligns with ISO/IEC 27001:2022 Annex A Control A.8.8 (Management of Technical Vulnerabilities).

Comprehensive and Detailed In-Depth Explanation:

A. Correct Answer:

Joint audits involve multiple teams but require only one designated audit team leader to ensure:

Consistent audit methodology

Coordination among teams

Unified reporting structure

B. Incorrect:

While each team may have a coordinator, there is only one main leader responsible for the audit.

C. Incorrect:

ISO 19011 mandates the presence of a designated audit team leader in all audits.

Relevant Standard Reference:

ISO 19011:2018 Clause 5.5.5 (Assigning Responsibility to the Audit Team Leader)

The use of probability theory in the sample selection process indicates that " statistical sampling " was used. Statistical sampling allows auditors to make inferences about the population based on the properties of the sample, relying on the principles of probability to select representative elements.

According to ISO/IEC 27001:2022, which specifies the requirements for establishing, implementing, maintaining and continually improving an information security management system (ISMS), control A.5.29 requires an organization to establish and maintain a business continuity management process to ensure the continued availability of information and information systems at the required level following disruptive incidents1. The organization should identify and prioritize critical information assets and processes, assess the risks and impacts of disruptive incidents, develop and implement business continuity plans (BCPs), test and review the BCPs, and ensure that relevant parties are aware of their roles and responsibilities1. Therefore, when verifying the information security of the business continuity management process, an ISMS auditor should verify that these aspects are met in accordance with the audit criteria.

Three options that will be in the audit trail for verifying control A.5.29 are:

Collect more evidence on how the organisation manages information security on mobile devices and during teleworking (Relevant to control A.6.7): This option is relevant because it can provide evidence of how the organization has implemented appropriate controls to protect the confidentiality, integrity and availability of information and information systems when staff work from home using mobile devices, such as laptops, tablets or smartphones. This is related to control A.6.7, which requires an organization to establish a policy and procedures for teleworking and use of mobile devices1.

Collect more evidence on how and when the Business Continuity Plan has been tested (Relevant to control A.5.29): This option is relevant because it can provide evidence of how the organization has tested and reviewed the BCPs to ensure their effectiveness and suitability for different scenarios, such as a pandemic. This is related to control A.5.29, which requires an organization to test and review the BCPs at planned intervals or when significant changes occur1.

Collect more evidence on how the organisation makes sure only staff with a negative test result can enter the organisation (Relevant to control A.7.2): This option is relevant because it can provide evidence of how the organization has implemented appropriate controls to prevent or reduce the risk of infection or transmission of diseases among staff or residents, such as requiring regular staff self-testing and using a health status app. This is related to control A.7.2, which requires an organization to ensure that all employees and contractors are aware of information security threats and concerns, their responsibilities and liabilities, and are equipped to support organizational policies and procedures in this respect1.

The other options are not relevant to verifying control A.5.29, as they are not related to the control or its requirements. For example:

Collect more evidence by interviewing more staff about their feeling about working from home (Relevant to clause 4.2): This option is not relevant because it does not provide evidence of how the organization has established and maintained a business continuity management process or ensured the continued availability of information and information systems following disruptive incidents. It may be related to clause 4.2, which requires an organization to understand the needs and expectations of interested parties, but not specifically to control A.5.29.

Collect more evidence on what resources the organisation provides to support the staff working from home (Relevant to clause 7.1): This option is not relevant because it does not provide evidence of how the organization has established and maintained a business continuity management process or ensured the continued availability of information and information systems following disruptive incidents. It may be related to clause 7.1, which requires an organization to determine and provide the resources needed for its ISMS, but not specifically to control A.5.29.

Collect more evidence on how the organisation performs a business risk assessment to evaluate how fast the existing residents can be discharged from the nursing home (Relevant to clause 6): This option is not relevant because it does not provide evidence of how the organization has established and maintained a business continuity management process or ensured the continued availability of information and information systems following disruptive incidents. It may be related to clause 6, which requires an organization to plan actions to address risks and opportunities for its ISMS, but not specifically to control A.5.29.

According to ISO 27001:2022 clause 9.1.2, the organisation shall conduct internal audits at planned intervals to provide information on whether the information security management system conforms to the organisation’s own requirements, the requirements of ISO 27001:2022, and is effectively implemented and maintained12

According to ISO 27001:2022 clause 10.1, the organisation shall react to the nonconformities and take action, as applicable, to control and correct them and deal with the consequences. The organisation shall also evaluate the need for action to eliminate the causes of nonconformities, in order to prevent recurrence or occurrence. The organisation shall implement any action needed, review the effectiveness of any corrective action taken, and make changes to the information security management system, if necessary12

A follow-up audit is a type of internal audit that is conducted after a previous audit to verify whether the nonconformities and corrective actions have been addressed and resolved, and whether the information security management system has been improved12

Therefore, the following statements are true for preparing a follow-up audit plan:

Verification should focus on whether any action undertaken is complete. This means that the auditor should check whether the organisation has implemented all the planned actions to correct and prevent the nonconformities, and whether the actions have been documented and communicated as required12

Verification should focus on whether any action undertaken has been undertaken effectively. This means that the auditor should check whether the organisation has achieved the intended results and objectives of the actions, and whether the actions have eliminated or reduced the nonconformities and their causes and consequences12

The following statements are false for preparing a follow-up audit plan:

Verification should focus on whether any action undertaken has been undertaken efficiently. This is false because efficiency is not a criterion for verifying the actions taken to address the nonconformities and corrective actions. Efficiency refers to the optimal use of resources to achieve the desired outcomes, but it is not a requirement of ISO 27001:2022. The auditor should focus on the effectiveness and completeness of the actions, not on the efficiency12

Corrections should be verified first, followed by corrective actions and finally opportunities for improvement. This is false because there is no prescribed order for verifying the corrections, corrective actions, and opportunities for improvement. The auditor should verify all the actions taken by the organisation, regardless of their sequence or priority. The auditor may choose to verify the actions based on their relevance, significance, or impact, but this is not a mandatory requirement12

Opportunities for improvement should be verified first, followed by corrections and finally corrective actions. This is false because there is no prescribed order for verifying the opportunities for improvement, corrections, and corrective actions. The auditor should verify all the actions taken by the organisation, regardless of their sequence or priority. The auditor may choose to verify the actions based on their relevance, significance, or impact, but this is not a mandatory requirement12

Corrective actions should be reviewed first, followed by corrections and finally opportunities for improvement. This is false because there is no prescribed order for reviewing the corrective actions, corrections, and opportunities for improvement. The auditor should review all the actions taken by the organisation, regardless of their sequence or priority. The auditor may choose to review the actions based on their relevance, significance, or impact, but this is not a mandatory requirement12