The best course of action to determine the root cause of the high number of policy exceptions approved by senior management is to interview the control owner. The control owner is the person who has the authority and responsibility for designing, implementing, and monitoring the controls that enforce the policy. The control owner can provide insight into the reasons, circumstances, and impacts of the policy exceptions, and the effectiveness and efficiency of the controls. The control owner can also suggest possible improvements or alternatives to the policy or the controls. The other options are not as useful as interviewing the control owner, as they are related to the review, analysis, or testing of the policy or the controls, not the investigation or understanding of the policy exceptions. References = Risk and Information Systems Control Study Manual, Chapter 4: Risk and Control Monitoring and Reporting, Section 4.4: Key Control Indicators, page 211.