360-degree feedback

In human resources, 360-degree feedback, also known as 'multi-rater feedback', 'multisource feedback', or 'multisource assessment', is employee development feedback that comes from all around the employee. "360" refers to the 360 degrees in a circle. The feedback would come from subordinates, peers, and managers in the organizational hierarchy, as well as self-assessment, and in some cases external sources such as customers and suppliers or other interested stakeholders. It may be contrasted with upward feedback, where managers are given feedback by their direct reports, or a traditional performance appraisal, where the employees are most often reviewed only by their manager.
See more at Wikipedia.org...

brings together formal appraisals from everybody that the person being assessed comes into contact with - line managers, subordinates, colleagues, peers, and even outsiders such as clients. Another name for it is multi-source feedback and a variant is upward feedback, in which subordinates appraise their supervisor's performance.