This study investigates the effectiveness of context-specific teaching materials delivered through an adapted process genre model of writing, in enhancing academic writing proficiency of tertiary level English foreign language (EFL) students. The study was conducted at a College of Technology in Oman and was motivated by the low EFL writing level of tertiary students at the college. The study employed a quasi-experimental design in which two main groups (experimental and control) were included. The experimental group received EFL writing instruction for one semester via the especially developed teaching materials, while the control group received EFL writing instruction via the prescribed textbook. The findings indicated statistically significant differences between the experimental and control groups in the Mid-Semester examination (MSE) and the Level-Exit examination (LEE). A qualitative analysis of the experimental group’s writing suggests that this group significantly outperformed the control group in writing fluency and accuracy. Therefore, based on the findings of the current study, it can be concluded that context-specific materials delivered through the proposed process genre model of writing are effective in enhancing tertiary level students’ academic writing proficiency in an EFL context. Specifically, the writing intervention had a positive effect on students’ ability to compose a variety of genres in an examination setting, which is an important finding, given that the process-genre approach to writing is normally not associated with writing in an examination setting. / Linguistics and Modern Languages / D. Litt. et Phil. (Linguistics)