In an appraisal rating scale it is best to use an even number of scale points, such as four or six, to discourage users from automatically focusing on a midpoint.

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Using an odd number of scale points in an appraisal rating scale, such as five or seven, is often preferred because it includes a midpoint. This allows for a neutral option, which can be important for accurately capturing an appraisee's performance when it is neither positive nor negative. An even number of scale points forces a choice towards either a positive or negative direction, which might not always accurately reflect the performance being appraised.

In an Appraisal Rating Scale It Is Best to Use