halo effect

is thought to be 'doggedly resistant to extinction', however, simply providing raters with more explicit scoring criteria can significantly reduce this effect, suggesting that it is not necessarily only a rater effect, but also a rating scale effect.

Study suggests that the halo effect and impressionistic type marking might be more widespread than has so far been reported. The halo effect is usually seen in the literature as being a rater effect that needs to be reduced or even eliminated by rater training. However, Cascio (1982, cited in Myford and Wolfe, 2003, p. 396) notes that the halo effect is 'doggedly resistant to extinction'. This study has shown that simply providing raters with more explicit scoring criteria can significantly reduce this effect. It could therefore be argued that the halo effect is not necessarily only a rater effect, but also a rating scale effect.

Ute Knoch

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