During the last decades students errors in learning foreign language has been the concern of teachers, linguists and researchers, for this reason many studies in applied linguistics are devoted to tackle this area. It is believed that errors have played an important role in the study of language acquisition in general and examining second/ foreign language in particular. Writing performance of university students has been declining and turns to be a problematic area for both learners and teachers. However, this book tries to address and find solution to the problems that encounter Arab learners of English in general and Sudanese English learners in particular in writing errors.