Unit did not achieve its targeted level (that is , the reduction in the number of defective unit was less than planned).In this case, the failure to produce the expect outcomes to other objectives(e.g., market share and revenue ) could be merely an implementation problem. On the other hand, if the targeted levels of performance drivers were achived and the expected outcomes did not materialize, then the problem could very well lie with the strategy itself. This is an examble of double-loop feedback. Double-loop feedback occurs whenever managers receive information about both the effectiveness of strategy implementation as well the validity of the assumptions underlying the strategy. In the traditional performance management system, typically, only single-loop feedback is provided. Single-loop feedback emphasizes only the effectiveness of implementation.In single-loop feedback, actual result deviating from planned result are a signal to take corrective action so that the plan (strategy) can be executed as intended. The validity of the assumptions underlying the plan is usually not questioned.