The performance of a power plant depends, among many things, on the performance of its control system. For peak plant performance the control loops should always be performing at the highest level possible. However, a typical power plant can have several hundred control loops, and to constantly monitor the performance of all these loops would be a tremendous and tedious task for a human to do manually. Consequently, most poorly performing control loops go unnoticed until they seriously affect production. A project was launched to test control performance monitoring software at two different types of power plants, evaluate its accuracy, capabilities, and benefits and document the findings in an EPRI report.