Detailed Answer
Correct answer: (C)
They allow comparisons across employees and departments
Conventional forms are used extensively because they are relatively easy to develop and permit quantitative results that allow comparisons across employees and departments. But because the rater has complete control in the use of the forms, conventional forms are subject to several errors. Often separate traits or factors are grouped together and the rater is given only one box to check. Frequently-used descriptive words can be subject to different meanings to different raters.
