Solving performance problems is often more difficult than it seems. Even if you have identified the cause of a performance problem, it can still be very difficult to resolve. Changing compensation or performance appraisal systems is a very powerful tool to modify employees' behavior and must be used carefully. If managers tell employees to do one thing, but the compensation or appraisal systems reward other behaviors, most employees will do what is rewarded. Many changes that leaders make have unintended consequences, which they must think through beforehand to motivate their employees to perform well.