According to the ISACA Risk and Information Systems Control study guide and handbook, the most important reason to communicate control effectiveness to senior management is to ensure management understands the current risk status. Control effectiveness is a measure of how well a control reduces the likelihood or impact of a risk event. By communicating control effectiveness, risk managers can provide management with relevant and timely information about the residual risk level, the risk appetite and tolerance, and the potential gaps or weaknesses in the control environment. This can help management make informed decisions about risk response strategies, resource allocation, and risk oversight12

1: ISACA Risk and Information Systems Control Study Guide, 4th Edition, page 33 2: ISACA Risk and Information Systems Control Handbook, 1st Edition, page 25