All the methods of performance measurement require decisions about who will collect and analyze the performance information. To qualify for this task, a person should have an understanding of the job requirements and the opportunity to see the employee doing the job. The traditional approach is for managers to gather information about their employees’ performances and arrive at performance ratings. However, many sources are possible. Possibilities of information sources include managers, peers, subordinates, self, and customers.To get as complete an assessment as possible, some organizations combine information from most or all of the possible sources, in what is called a 360-degree performance appraisal.