This paper aims to investigate the effectiveness of using cohesive devices and writing strategies in developing EFL learners' writing skills. The researcher has adopted the quantitative method as well as the questionnaire and test as tools for collecting data relevant to the study. To bring to the light the importance of cohesive devices in writing kills. The sample of this study comprises of (100) first year students who study English at (SUST). They were divided equally into two groups: control group and experimental group. The experimental group was given a test and the second group was given a test but after they had been taught how to use cohesive devices in writing skills. The marks obtained from the two tests were compared. From one hand, the results have revealed that the experimental group encountered difficulties in using cohesive devices in writing skills. From the other hand, the control group performed slightly better.
