Internal audit reports provide the most useful information to assess the magnitude of identified deficiencies in the IT control environment. Internal audit reports are independent and objective evaluations of the design and operating effectiveness of the IT controls, as well as the compliance with policies, standards, and regulations. Internal audit reports also provide recommendations for improvement and follow-up actions for the control deficiencies. Internal audit reports can help measure the impact and severity of the control deficiencies, and prioritize the remediation efforts. Peer benchmarks, business impact analysis (BIA) results, and threat analysis results are not as directly related to the assessment of the control deficiencies, although they may provide some contextual or comparative information. References = Risk and Information Systems Control Study Manual, Chapter 1, Section 1.4.1, page 1-19.