Final answer:
By including peer evaluations in the appraisal process, a supervisor can enhance the accuracy of performance appraisals through a comprehensive 360-degree feedback system, though it may increase the time required to complete the appraisals.
Step-by-step explanation:
Supplementing supervisory appraisals with peer evaluations can make the appraisal process more accurate. The 360-degree performance appraisal system, which includes feedback from supervisors, peers, direct reports, and sometimes even customers, is designed to offer a more comprehensive view of an employee's performance. While studies have shown mixed results regarding the reliability of self and peer ratings, the diversity of perspectives provided by a 360-degree system is intended to foster greater understanding and improvement in employees throughout the organization.
However, this process can also be more time-consuming due to the need to gather and analyze a larger volume of feedback. The traditional performance appraisal often relies on a job analysis and set goals, and while peer evaluations add depth to this process, they require additional coordination and discussion among employees and their supervisors.