Hi,
Operationally, there is NO difference between the two.
Both lead to your/organization's judgment as to the performance of the individual in question. Appraisal sounds more refined than the evaluation, in that one is to "measure" against a yardstick, and the other is to judge (perhaps even without "measuring").
In that sense, appraisal tends to be understood as more "objective," and the evaluation appears to be more "subjective." But this need not necessarily be so, and how it will be depends upon the individual who appraises or evaluates, their training, their competence on the job, and their own personality strengths and weaknesses.
It is the system of appraisal and the training of the appraisers and the organizational culture that decide if the exercise proves helpful or not. In many cases, in the name of "performance appraisal," what actually takes place is "personal appraisals." That would be a disaster. In appraisal, the priority is to appraise the performance ahead of the person.
It is indeed enough to conduct appraisals for the "waiters" on a yearly basis, but the performance must be reviewed, preferably every three months for many reasons, and that applies to all levels of appraisals.
Has your query been answered now?
Regards,
Samvedan
October 2, 2006