
Performance Measurement 257
anchors, such scale may sometimes be ambiguous. Raters may use the scale in different ways, which
may raise the problem of validity (when two workers are rated by different raters). However, such
problems now-a-days are eliminated signifi cantly by using various behaviour-based scales, which help
us to assess specifi c work related behaviours. Some of the behaviour-based scales are discussed below.
Several alternate measurement methods and systems have been developed over the years includ-
ing management-by-objectives (MBO), behaviourally anchored rating scales (BARS), the mixed-stan-
dard scale (MSS), quantitatively ...