Increasing group and team effectiveness is fundamental for any organisation, especially during periods of economic crisis. In order to build or design a team or to optimise its work, it is necessary to consider tasks, processes and results. Given that teams are a key tool for competitiveness in the automotive sector, this paper focuses on how to improve the performance and the effectiveness of production teams in Spain's automotive industry through three processes: group development, group identification, and team potency. The results show that these processes predict 57% of group performance, and in particular two of the effectiveness criteria used in this sector: absenteeism and order and hygiene in the workplace. We discuss the usefulness of these results for managers and team leaders in order to improve team performance and effectiveness in the automotive sector.