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Forty-eight quantitative peer assessment studies comparing peer and teacher marks were subjected to meta-analysis. Peer assessments were found to resemble more closely teacher assessments when global judgements based on well understood criteria are used rather than when marking involves assessing several individual dimensions. Similarly, peer assessments better resemble faculty assessments when academic products and processes, rather than professional practice, are being rated. Studies with high design quality appear to be associated with more valid peer assessments than those which have poor experimental design. Hypotheses concerning the greater validity of peer assessments in advanced rather than beginner courses and in science and engineering rather than in other discipline areas were not supported. In addition, multiple ratings were not found to be better than ratings by singletons. The study pointed to differences between self and peer assessments, which are explored briefly. Results are discussed and fruitful areas for further research in peer assessment are suggested.
Falchikov et al. (2000) studied this question.