... development of instructional skills for cooperative learning for students such as through in-service teacher training, application of these skills in practice, organization of professional meetings ... situations for a target group, help them develop cognition and skills based on existing knowledge and skills and through their learning or reinforcement activities. 1.1.3.5. Concept of professional ... OBSERVATIONS AND ASSESMENT OF SKILL DEVELOPMENT OF TEACHERS To test the effect of instructional system for cooperative learning on the quality of cooperative learning of students, we conducted...