What is a typical reason for a failed incentive plan? too many exceptions O impossible objectives wages are high enough already supervisors have not been trained in performance appraisal The main requirement for successful inclusion of a group of employees in an incentive plan is they are: O paid hourly O professional employees O in jobs that are easily described O in jobs whose purpose is measurable Your organization needs an incentive plan to motivate employees on jobs that lack standardization and repetition. Which type of plan is more appropriate? O piecework O standard hour O gainsharing When designing a large group incentive plan, which is not one of the most commonly used financial metrics? O revenue EBITDA O performance O earnings per share O operating income