The use of online learning together with the traditional face-to-face teaching is now becoming a global trend in English language classrooms. This book aims at investigating the impact of using the blended learning (online and face-to-face learning) approach in teaching task-based English writing on the achievement and attitude of students at tertiary level. A random sample of seventy second-year students (2009/2010) at Computer Science and Information Technology College, University of Science and Technology, Omdurman, has been chosen to carry out the experiment. Findings indicate that there is a significant relationship between using the blended learning approach and students’ attitude towards learning task-based writing. Based on the findings of this research, a series of recommendations were formulated the most important of which is that; using the blended learning approach in teaching writing at the tertiary level is highly recommended. Also, it is recommended that blended learning approach should be integrated in teaching the reading, speaking and listening skills in English at the tertiary level.