Performance appraisal is always a Triangle of you with Agile values & principles and individual performance. Agile Says team matters not individuals, Performance Appraisal says, You matter not others, now you got in love with both Team from agile and Individual from Performance appraisal. How does Performance appraisal to be done to reward some one in Agile context. Note: if you are pure agilist, you don't need to be worried about performance appraisal but not many are