The disadvantages are numerous. A rater's biases are likely to be reflected in a subjective instrument of this type. Specific criteria may be omitted to make the form applicable to a variety of jobs. For example, "maintenance of equipment may be left out because it applies to only a few workers, although ior some en ployees it may be the most important part of the job. This omission and others tend to limit specific feedback. These descriptive evaluations also are subject to individual biases and interpretations. When specific performance criteria are hard to identify, the form may rely on irrelevant personality traits that dilute the