360-degree Feedback

Definition: 360-degree Feedback is an appraisal technique in which an image of an employee is produced from multiple angles, leading to a circular (hence: 360°) picture of the employee.
Most often, 360-DFB will include direct feedback from an employee's subordinates, peers, and supervisor(s), as well as a self-evaluation.

More on 360-degree feedback. More on appraisals and performance management: Performance Appraisal.