The purpose of this workshop is to provide an opportunity for delegates to participate in an intervention aimed at enhancing assessment skills in cooperative learning. Differentiating assessment of individuals' intellectual abilities, academic and social skills from that of the whole group's achievements when using cooperative learning instruction is, according to earlier research, a challenge for teachers (e.g., Forslund Frykedal & Hammar Chiriac, 2011; Ross & Rolheiser, 2003). In this workshop participants will take part in, discuss and reflect upon objects and methods concerning assessment in cooperative learning, by using, the Social Interdependence Theory's five elements; (a) interdependence, (b) accountability, (c) promotive interaction, (d) interpersonal and small group skills, and (e) group processes, when reviewing and discerning assessable objects in a cooperative situation. The discerned objects will then be presented, discussed and reflected upon in cross-groups. Additionally, participation in the workshop also includes peer-assessment of group-members' abilities and skills in terms of "two stars and a wish". During this interactive workshop, participants will work in different constellations, such as pairs, small groups and cross-groups, giving experiences in the interdependence between CL and assessment. It's an exercise giving delegates assessment tools useful in pedagogical practice.