Evaluation processes must be conceived in line with learner-centered emphasis though instruction in English for Academic Purposes (EAP) is grounded on learner-centered approaches, EAP- English for Academic Purpose, which is considered as a major important functional feature of the language. Formative evaluation is major evaluation approach that provides various advantages for EAP students. This study examined (n=50) the perception of lecturers in three Thai universities, including Walailak, of including the inclusion of formative assessments in EAP instruction. The findings showed that, despite several obstacles to its implementation, lecturers have adapted optimistic attitudes to the use of formative evaluation in EAP education through studies and interviews. In addition, the instructors knew the merits of EAP training assessment. However, the expertise and the knowledge required for the formational assessment of EAP instructions were not available to them. The main evaluation in the form of the final examination was summative. This study suggests that formative evaluation should be taken into account in the EAP curriculum.