Hello Ankita,
There are many methods by which you can measure performance. To be frank, there is nothing called a good performance appraisal (PA). But something will suit best for your company, and it will emanate from what your goals are in the company and what you are going to measure to ensure that these goals are achieved. If you keep this principle in mind, you will not go wrong. Out of the many methods of performance appraisal (PA) available, you can then choose the best one suited to your needs.
Sajan