The IS auditor's most important course of action after finding that several similar incidents were logged during the audit period is to determine if a root cause analysis was conducted. A root cause analysis is a systematic process that identifies the underlying causes of system failures or incidents. A root cause analysis can help to prevent recurrence of similar incidents, improve system performance and reliability, and enhance incident management processes. The IS auditor should evaluate whether a root cause analysis was performed for each incident, whether it was timely and thorough, and whether it resulted in effective corrective actions.

The most significant risk that IS auditors are required to consider for each engagement is the misalignment with business objectives. This is because IS audit engagements are intended to provide assurance that the IT systems and processes support the achievement of the business objectives and strategies. If there is a misalignment, it could result in wasted resources, missed opportunities, inefficiencies, errors, or failures that could adversely affect the organization's performance and reputation12. References: 1: CISA Review Manual (Digital Version), Chapter 1: The Process of Auditing Information Systems, Section 1.3: Audit Risk, page
28 2: CISA Online Review Course, Module 1: The Process of Auditing Information Systems, Lesson 1.3:
Audit Risk

An organization outsourced its IS functions. To meet its responsibility for disaster recovery, the organization should coordinate disaster recovery administration with the outsourcing vendor. This is because the organization remains accountable for ensuring the continuity and availability of its IS functions, even if they are outsourced to a third party. The organization should establish clear roles and responsibilities, communication channels, testing procedures, and escalation processes with the outsourcing vendor for disaster recovery purposes. The organization should not discontinue maintenance of the disaster recovery plan (DRP), as it still needs to have a documented and updated plan for restoring its IS functions in case of a disaster. The organization should not delegate evaluation of disaster recovery to a third party or internal audit, as it still needs to monitor and review the performance and compliance of the outsourcing vendor with respect to disaster recovery objectives and standards. References: CISA Review Manual (Digital Version), [ISACA Auditing Standards]

Due professional care is the obligation of an IS auditor to exercise the appropriate level of skill, competence, and diligence in performing an audit. It also requires the IS auditor to comply with the relevant standards, guidelines, and ethical principles of the profession. Completing an engagement by email only may compromise due professional care, as it may limit the IS auditor's ability to obtain sufficient and appropriate evidence, to communicate effectively with the auditee and other stakeholders, and to perform adequate quality assurance and review procedures. The other options are not as relevant as due professional care, as they relate to specific aspects of an audit, such as proficiency (the knowledge and skills of the IS auditor), sufficient evidence (the quantity and quality of the audit evidence), and reporting (the presentation and communication of the audit results). References: CISA Review Manual (Digital Version), Domain 1: The Process of Auditing Information Systems, Section 1.2 ISACA IT Audit and Assurance Standards