The document discusses 360 degree feedback as a performance appraisal tool. 360 degree feedback involves collecting feedback about an employee from peers, managers, direct reports, and customers. This provides a more well-rounded view of performance compared to evaluations only from supervisors. The document outlines some benefits of 360 degree feedback such as facilitating self-development and strengthening responsibility. It also discusses some common mistakes like not having a clear purpose or compromising confidentiality and provides solutions to address these issues.