The best time to evaluate current control effectiveness when implementing an IT risk management program is during the risk assessment, as it involves measuring and testing the performance and adequacy of the existing controls, and identifying any control gaps ordeficiencies that may affect the risk level and response. Before defining a framework, when evaluating risk response, and when updating the risk register are not the best times, as they are more related to the design, selection, or reporting of the controls, respectively, rather than theevaluation of the control effectiveness. References = CRISC Review Manual, 7th Edition, page 154.