At a coaching review, a manager said to me ” The toughest part of employee appraisal is not evaluating employee performance but convincing the employee after that”. I could understand what he meant. The tough part was getting the employee to accept the basis for the evaluation.
Organizations spend huge amounts of money in putting together a formal performance evaluation process. If you ask me, I would say that the most important part of this process is the last bit. Where the manager sits down in front of the employees and conducts a dialogue on his/her evaluation. If this part is weak, as is the case in many organizations as per my experience, no amount of work in earlier parts of the appraisal process is worth it.