Typically, strategies for maintaining assets are put in place when the asset is installed or as a reaction to a failure. These strategies range from a run-to-failure to continuous CbM monitoring. As a function is continuous improvement, it becomes necessary to go back and evaluate that strategy's effectiveness. In performing Preventive Maintenance Optimization (PMO), you to leverage actual performance against various inputs that created the strategy (FMEAs, RCAs, or even knee-jerk reactions) to determine if any changes are needed.