ABSTRACT
Professional skepticism is a key component of an auditor's duty of care that applies throughout the engagement. It is an attitude that includes a questioning mind and a critical assessment of the appropriateness and sufficiency of audit evidence. Professional skepticism is fundamental to the role and performance of internal auditors and it is a key aspect of audit quality. It has three elements: Attributes, mindset and action. Internal auditing best practices make it clear that objectivity and professional skepticism are a key attribute of the capabilities of internal audit firms and their staff. Professional skepticism is a key component of effective internal audits and a key ingredient of audit quality. Care is required because time and cost constraints, familiarity with the client, stress, and the amount of experience may affect the degree of skepticism applied. Internal auditors should remain vigilant and appropriately skeptical while performing their duties.
