The August 2013 issue of Manager’s Legal Bulletin had an extremely informative article on the mistakes managers make when evaluating staff. The most common mistakes—-
*Rating all employees as average. Don’t do this. Employees perceive this as an “easy and lazy way out” for managers . This will also anger top performers and encourage poor performers to maintain the status quo.
*Failure to explain the reasons for the ratings. Always provide concrete examples that back up your ratings.
*Putting too much emphasis on how employees stack up against one another. Don’t. Base your evaluations on performance standards and expectations.
*Evaluations based only on recent performance. Reviews should cover an entire 12 month period and address progress over that time period.
*Letting personal feelings influence the evaluation.
Pretty sound advice.