Research shows that employees view evaluations more fairly if they have a role in the  evaluation.  This may sound strange to some, but the benefit is a happier more stable employee base and therefore worth the effort.

Implementation is much more simple than you might think.

A simple implementation is:

• Provide employee written responsibility and evaluation criteria.
• Allow and encourage employees to provide information that will support the criteria.  This not only involves them, but also gives them a strong concrete means to improve their performance.
• Provide a written summary of your evaluation to the employee and allow them to respond in writing while the evaluation is in "Draft" format.
• During the evaluation review the submitted information and responses while providing your final assessment.