According to IIA guidance, the nature and scope of assurance and consulting services to be...

According to the Institute of Internal Auditors (IIA) guidance, the nature and scope of assurance and consulting services provided by the internal audit function should be clearly delineated in the internal audit charter. The charter is a formal document that defines the internal audit activity's purpose, authority, and responsibility, setting the scope within which the internal audit team operates.

The IIA's International Professional Practices Framework (IPPF), specifically the guidance related to internal audit charters.

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