It is commonly believed that the practice of intentionally distorting
performance appraisals is widespread among those serving as raters in
the appraisal process. This behavior is theorized to result from consc
ious decisions about the direction and degree of distortion to introdu
ce into ratings at the point where they are reported. A model of the d
eterminants of such decisions is proposed and issues in the model's op
erationalization, validation, and implementation in practice are discu
ssed.