Deloitte implemented a new performance appraisal system for several reasons. Their previous system was no longer effectively evaluating employees and fostering high performance. The new system focused on more frequent check-ins between managers and employees, provided coaching support, and used scatterplots to evaluate employees relative to peers. It proved more effective by increasing employee participation, boosting productivity, providing a more time-efficient and holistic review that enhanced communication about performance improvements. For appraisals to be fair and effective, companies should ensure managers know their employees well, include fairness reviews, and gather employee feedback to continually improve the process.