What vare various components of 360 degree appraisal?

The various components of 369 degree appraisal are:
Performance appraisal has come to occupy a vital place in human resource function. 360 system involves evaluation of a manager by everyone above, alongside and below him

(1) Self-Appraisal

(2) Superior’s Appraisal

(3) Subordinate’s Appraisal

(4) Peer Appraisal