This project tried to generate a learning strategy based on the cooperative work in the habitual students' activities of the Data analysis in psychology subject in order to improve the teaching in this subject. During the academic year 2004-2005, a strategy of cooperative learning was put into practice. We worked with a sample of 415 students of the University of Barcelona, 211 students carried out cooperative work and 204 students did individual work. The results showed the existence of a greater satisfaction with the work among the students who did it cooperatively than among those who did it individually.