Dana Has Recently Been Promoted to a Managerial Position

Dana has recently been promoted to a managerial position.One of the central tasks of her job is to evaluate the performance of employees in her group.As a new manager,she feels overwhelmed with this responsibility and laments,"Where am I going to find enough time to monitor the performance of all my subordinates? I can't be sitting the whole day just watching them work." What are the other sources of employee performance data that she can utilize? Advise her on how to wisely use these multiple sources of data.