‹ HC-5.4.4 HC-5.4.6 › HC-5.4.5 Internal audit functions must have terms of reference that clearly indicate: (a) The scope and frequency of audits; (b) Reporting lines; and (c) The review and approval process applied to audits. April 2016 ‹ HC-5.4.4 HC-5.4.6 ›