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van Driel b and Paul van den Broek c a leiden university graduate school of teaching (iclon), leiden, the netherlands; b melbourne graduate school of teaching, the university of melbourne, melbourne, Australia; c department of educational science, leiden university, leiden, the netherlands ABSTRACT Within the higher education context, peer feedback is frequently applied as an instructional method. Research on the learning mechanisms involved in the peer feedback process has covered aspects of both providing and receiving feedback. However, a direct comparison of the impact that providing and receiving peer feedback has on students' writing performance is still lacking. The current study compared the writing performance of undergraduate students (N = 83) who either provided or received anonymous written peer feedback in the context of an authentic academic writing task. In addition, we investigated whether students' peer feedback perceptions were related to the nature of the peer feedback they received and to writing performance. Results showed that both providing and receiving feedback led to similar improvements of writing performance. The presence of explanatory comments positively related both to how adequate students perceived the peer feedback to be, as well as to students' willingness to improve based upon it. However, no direct relation was found between these peer feedback perceptions and students' writing performance increase. The reader as evaluator imposes additional goals or criteria on the text… In a sense then, the process of evaluation simply turns up the power on the reading process: It enlarges the set of constraints that the mental representation one is building must meet and turns reading into testing. (Flower et al. 1986, 23)

Peer feedback is frequently implemented with academic writing tasks in higher education. However, a quantitative synthesis is still lacking for the impact that peer feedback has on students' writing performance. The current study conveyed two types of observations. First, regarding the impact of peer feedback on writing performance, this study synthesized the results of 24 quantitative studies reporting on higher education students' academic writing performance after peer feedback. Engagement in peer feedback resulted in larger writing improvements compared to (no-feedback) controls (g ¼ 0.91 [0.41, 1.42]) and compared to self-assessment (g ¼ 0.33 [0.01, 0.64]). Peer feedback and teacher feedback resulted in similar writing improvements (g ¼ 0.46 [-0.44, 1.36]). The nature of the peer feedback significantly moderated the impact that peer feedback had on students' writing improvement, whereas only a theoretically plausible, though non-significant moderating pattern was found for the number of peers that students engaged with. Second, this study shows that the number of well-controlled studies into the effects of peer feedback on writing is still low, indicating the need for more quantitative, methodologically sound research in this field. Findings and implications are discussed both for higher education teaching practice and future research approaches and directions.

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We present a study on the effect of instruction on collaboration in a collaborative discovery learning environment. The instruction we used, called RIDE, is built upon four principles identified in the literature on collaborative processes: Respect, Intelligent collaboration, Deciding together, and Encouraging. In an experimental study, a group of learners (ages 15-17) receiving this instruction was compared to a control group. The learners worked in dyads on separate computers in a shared discovery learning environment in the physics domain of collisions, communicating through a chat channel. Qualitative and quantitative analyses of the logged actions in the learning environment and the chat protocols showed that the RIDE instruction can lead to more constructive communication, and improved discovery learning activities, as expected, although no direct effect on discovery learning results was found. This study shows the benefits of providing instruction on effective communication and the learning process in a collaborative discovery learning situation.