To ensure that due professional care has been taken at all times during an engagement, the internal auditor should always
a. Communicate any noncompliance or irregularity discovered during an engagement promptly to the audit committee.
b. Ensure that all financial information related to the audit is included in the audit plan and examined for nonconformance or irregularities.
c. Consider the possibility of nonconformance or irregularities at all times during an engagement.
d. Ensure that all audit tests are fully documented.
c. Consider the possibility of nonconformance or irregularities at all times during an engagement. Due professional care implies reasonable care and competence, not infallibility or extraordinary performance. Thus, due professional care requires the internal auditor to conduct examinations and verifications to a reasonable extent. Accordingly, internal auditors cannot give absolute assurance that noncompliance or irregularities do not exist. Nevertheless, the possibility of material irregularities or noncompliance needs to be considered whenever the internal auditor undertakes an internal auditing assignment (PA 1220-1). Thus, considering the possibility of nonconformance or material irregularities at all times during an engagement is the only way of demonstrating that due professional care has been taken in an internal audit assignment.