‹ HC-6.4.5 HC-6.4.7 › HC-6.4.6 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. January 2011 ‹ HC-6.4.5 HC-6.4.7 ›