A study is concerned with measuring the technical efficiency of a group of colleges affiliated to a university, using the DEA method. It was limited to three inputs (number of students, number of employees and number of teachers) and three outputs (number of conferences and seminars, number of published scientific research and number of graduates). The following table summarizes the inputs and outputs of each decision unit (university) during the academic year 20202021. Reference College(s) for College No. 4 isiare a. College No. 3 b. College No, 1 and College No. 3 c. College No. 1 and College No. 4 d. it has no reference colleges