This book reports on three research studies. Study 1, which investigated the effects of peer-editing on students’ revised and new essays, revealed that students did not benefit from peer feedback in their revised drafts but improved the quality of their new essays. Study 2 examined the reasons for students’ failure to benefit from their peers’ feedback and found the answer in students’ culture of learning. Study 3 employed experimental and control groups to test students’ ability to correct specific language errors. Compared to the control group who self-edited their essays, the experimental group, who received peer feedback, significantly improved their writing in revised drafts and in new essays. Also, the experimental group significantly reduced rule-based language errors in revised drafts but not in new essays. However, errors that are not rule-based were not significantly reduced in revised drafts or in new essays. Demonstrating the importance of peer interaction in developing...