Cooperative Learning is an instructional model in which learners work together toward a common goal (Johnson & Johnson, 1986; Slavin, 1993). Research has clearly shown that cooperation results in higher levels of achievement (Johnson, et al., 1993). This article focuses on Cooperative Assessment, two students, one paper, as learning, and proposes viewing assessment as an integral part of the process of learning and teaching by trying to provoke thoughts about positive interdependence, individual accountability and social skill development, three key features of Cooperative Learning. The paper presents pre-service English Language Teachers' reflections on Cooperative Assessment used as part of the final exam for "Individual Differences in Foreign Language Learning" course in Fall Semester of 2018-2019 academic year.