An internal audit activity maintains a quality assurance and improvement program that includes annual self-assessments.

The inclusion of a clause in each engagement report stating that the engagement conforms with the International Standards for the Professional Practice of Internal Auditing is justified if the internal audit activity's policies and engagement records provide relevant, sufficient, and competent evidence that this statement is correct. This indicates that the internal audit activity consistently applies the standards in its engagements and the quality assurance and improvement program effectively monitors and ensures this conformance.

IIA Standard 1300: "Quality Assurance and Improvement Program"