What is the purpose of an internal control questionnaire?

An internal control questionnaire (ICQ) is a tool used by auditors to gather detailed information about the internal control system of an audited area. The primary purpose of an ICQ is to identify and assess risks that could prevent the area from achieving its objectives. By systematically covering various control points, the questionnaire helps the auditor evaluate the adequacy and effectiveness of controls in place and identify areas where controls may be lacking or need improvement.

The Institute of Internal Auditors (IIA) - Practice Guide: Internal Control Questionnaire