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We study a dynamic moral hazard model where the agent does not fully observe his performance. We consider the incentive effects of providing feedback to the agent: revealing to the agent how well he is doing. We show that, if the incentive scheme is exogenously given, there is a wide range of cases where the agent works harder if feedback is provided. However, the agent earns more money in this scenario. We then characterize the optimal incentive schemes in the two scenarios and we show that the principal is better off if feedback is not provided; the expected cost of inducing any given level of expected effort is lower in the no-revelation scenario. Download Paper