A working team is the core of a healthy and efficient company. Even if every worker has a relevant skill set, today the productivity can be obtained also through the creativity and the problem-solving, the testing and an equal share of enthusiasm. These are all transversal skills that we can find and develop much better when we form a team. A team is a group able to work for common goals, increasing the performance level to achieve what individuals could never obtain. One of the most required skills in the staff selection is the ability to be able of working in a team, or the ability to cooperate. But what does that mean exactly?