The didactic unit “rope jumping together” was developed with students
in year 5 of Primary Education with no previous experience in
systematic cooperative learning. According to Pujolás (2008, pp. 1 54-
1 55) “before introducing cooperative learning, the group must be
minimally prepared gradually creating a favorable atmosphere for
cooperation, mutual help and solidarity.” In this sense, we followed the
recommendations given by León (2002) and a unit of cooperative games
and group dynamics was developed before working on cooperative
learning. It was aimed at determining the level of social skills and group
cohesion among students and presenting the logical structure of
cooperative processes. Consequently, the teacher reinforced any helping,
supportive or cooperative behavior manifested in the classroom.