This document discusses performance appraisal systems used by organizations. It defines performance appraisal and explains that it is used for human resource planning, employee training and development, compensation, and assessing potential. Several common performance appraisal methods are described, including 360-degree feedback, rating scales, critical incidents, essays, rankings, and work standards. Limitations of performance appraisal like halo effects, central tendency, and personal bias are also outlined. Finally, characteristics of effective appraisal systems like using job-related criteria and continuous open communication are presented.