A baseline assessment is the first step in assessing the maturity of an organization’s internal control environment. A baseline assessment is a comprehensive evaluation of the current state of the internal control structure, processes, and activities across the organization. A baseline assessment helps to identify the strengths and weaknesses of the existing internal controls, as well as the gaps and opportunities for improvement. A baseline assessment also provides a reference point for measuring the progress and effectiveness of the internal control improvement initiatives. The other options are not the first steps in assessing the maturity of an internal control environment, although they may be part of the subsequent steps. Validating control process execution is a technique to verify that the internal control activities are performed as designed and intended. Determining if controls are effective is a process to evaluate the adequacy and efficiency of the internal controls in achieving the desired outcomes and mitigating the risks. Identifying key process owners is a task to assign the roles and responsibilities for the internal control design, implementation, and monitoring to the appropriate individuals or groupswithin theorganization. References = CRISC Review Manual, pages 153-1541; CRISC Review Questions, Answers & Explanations Manual, page 742