these tree studies are particularly interesting in that they highlight potential reasons why affective commitment and performance indicators are not significantly related in every study in which they are examined first it is possible that any relations between employee commitment and ratings of employee performance made by supervisors are moderated by the seriousness with which raters take the appraisal process consider the study by decotiis and summers 1987 in which supervisor ratings were unrelated to employee commitment decotiis and summer questioned whether the performance appraisal system was taken at all seriously by the supervisors in their study noting that although appraisals had been in place for several years they had not been used as inputs to personnel decisions such as pay and promotion if supervisors do not take them seriously the validity of performance ratings- and therefore the research findings based on these ratings are in questions