The purpose of this study was to examine the perception of students, peer assisters and the department head towards peer assisted instruction. It also aimed to investigate the extent of its implementation in sport sciences department and challenges which hamper its effectiveness. The subjects were peer assisters, tutees and the department head. They were selected through purposive sampling technique. Questionnaire, interview and focus group discussions were employed as data gathering instruments. The findings indicated that tutees, peer assisters and the department head have positive perceptions toward peer assisted learning instruction. They perceived that peer assisted instructional approach helps learners to develop their academic achievement, to enhance their social interaction skills and to manage their psychological difficulties. However, the practices were limited to activities such as doing assignments and project works, sharing their learning and studying experience. The data also revealed that factors such as lack of tutees motivation, lack of facilities, lack of support from the department, lack of peer assister tutoring experience were the observed challenges which affect students’ engagement in peer assisted instructional model.