This experimental study is aimed at examining the effect of involving pupils in primary education in setting assessment criteria and standards on their appraisal of a peer's work and their peer feedback style. It is expected that our intervention will lead to (1) a criteria-referenced appraisal and (2) more final vocabulary, which is associated with a more authoritative style. In total, 95 sixth grade pupils from The Netherlands were randomly assigned to one of two conditions. In the experimental group, the pupils first received an exemplar, which was followed by a group discussion about appropriate assessment criteria and standards. In the control group, the pupils provided peer feedback without this discussion. Their peer appraisal was measured with a questionnaire and feedback style was determined by analysing the written feedback using a person-oriented approach (cluster analysis). Results showed that the chance that pupils in the experimental group had an authoritative style was three times higher than in the control group. Theoretical and practical implications of the study are discussed.