Introduction and purpose: In schools not performing OSCE method, faculty members' lack of time, human resources and managing the complexity of such exam are the most common obstacles. In this study, we utilized different methods to evaluate the the validity and reliability of a simple diversified OSCE as part of final exam for ambulatory care clerkship along with the theoretical exam. Methods: We analyzed the correlation and difference between students' achievements in the written exam and their achievements in OSCE. We also compared between students' achievements according to each OSCE station they enrolled in. As students' feedback is an important indicator of the success of the learning process, students' feedback about OSCE was also measured. Results: A moderate correlation was observed between students' overall marks in OSCE and that in written exam (r 2 = 0.36 p= 0.001). Prescription station showed a moderate correlation with the written exam (r 2 = 0.30, p < 0.001) and the counseling station showed a weak correlation (r