This work is the first in the field which aims to explore online peer feedback in Saudi EFL writing class and its impact on revision. The book is organized into five chapters. The first chapter introduces the topic of online peer feedback in writing class focusing on the purpose and significant of the study. The second chapter provides the theoretical perspective on online CF and the writing process approach. Chapter three deals with the study design of online writing class and how did the students exchange their writing drafts under their teacher's supervision. Chapter four displays the findings of the study and chapter five provides a conclusion with recommendations for further study.