When an internal auditor discovers an issue such as a programming error allowing multiple accounts for a single address, the auditor should ensure that the corrective actions are both adequate and effective. This includes scheduling a follow-up review (1) to verify that the program has been corrected and that the accounts have been consolidated. Additionally, evaluating the adequacy and effectiveness of the corrective action proposed by management (2) is essential to ensure the issue has been resolved properly. Reference: = IIA Standard 2500 - Monitoring Progress and IIA Standard 2320 - Analysis and Evaluation.