The principle guiding GST in its choice of partners is based on a common vision, in terms of integrity, passion, performance, and social responsibility. Once these values have been established, the basis for a possible partnership are, from a technical point of view, the complementarity of functions and the corresponding skills. In addition, a sincere understanding of their respective strengths and weaknesses, as well as the ability to compensate for the weaknesses of one of the partners with the strengths of the other, are the best guarantee for successful teamwork.