At the executive level, ESRO was managed by a Directorate based in Paris, including the Director General assisted by a Scientific Director, a Technical Director and a Head of Administration . The directors of ESRIN, ESDAC and ESLAB reported to the Scientific Director; the director of ESTEC, who had also responsibility for ESRANGE and ESTRACK, reported to the Technical Director. The "Executive", as it was eventually called, was responsible for the implementation of approved programmes within the established financial envelope and under general control from the Scientific and Technical Committee. It was also called to perform feasibility studies of space missions proposals coming from the scientific community and recommended by the STC, in view of their eventual adoption in the programme.