An internal auditor used a risk and control matrix to prepare a work program for...

If a control is found to be poorly designed during the planning stage, testing its operating effectiveness becomes redundant because even a well-implemented but poorly designed control will not achieve its intended objectives. The primary focus should be on redesigning the control to ensure it is effective in mitigating risks. Therefore, the auditor should not have proceeded to test the operational effectiveness of a control that was already deemed poorly designed.

The Institute of Internal Auditors (IIA), International Standards for the Professional Practice of Internal Auditing (Standards)

" Auditing: A Risk-Based Approach to Conducting a Quality Audit " by Karla M. Johnstone et al.