The effects of task-based language teaching (TBLT) on reading comprehension of EAP students has not received due attention in the literature. Using a mixed-methods approach, the research examines whether TBLT improves reading comprehension more effectively compared to traditional English for academic purposes methodologies. In this study, a sample of 100 intermediate-level Iranian university students was selected through convenience sampling and randomly divided into four groups of 25 participants each (comprising two control groups and two experimental groups). The experimental groups, one in psychology and one in accounting, were instructed using TBLT, while the control groups, also in psychology and accounting, followed traditional EAP instruction as dictated by the curriculum and course instructor. Initially, all groups completed a piloted, researcher-developed reading comprehension pretest. In the experimental groups, the syllabus was co-constructed through negotiation, reflecting the students' needs and rights. In contrast, the control groups were taught using textbooks predetermined by the curriculum. Upon the completion of the treatment sessions, all participants took a posttest. Both quantitative and qualitative analyses revealed that TBLT significantly enhanced the reading comprehension skills of Iranian university students compared to traditional EAP methods. Additionally, the study found that the field of study did not influence the effectiveness of the instructional method (TBLT or EAP). These findings provide valuable insights for English for specific purposes (ESP) teachers and material developers, emphasizing the potential benefits of incorporating TBLT into EAP instruction.
