9 In exercising supreme, full, and immediate power in the universal Church, the Roman pontiff makes use of the departments of the Roman Curia which, therefore, perform their duties in his name and with his authority for the good of the churches and in the service of the sacred pastors. The fathers of this sacred council, however, desire that these departments-which have furnished distinguished assistance to the Roman pontiff and the pastors of the Church-be reorganized and better adapted to the needs of the times, regions, and rites especially as regards their number, name, competence and peculiar method of' procedure, as well as the coordination of work among them. The fathers also desire that, in view of the very nature of the pastoral office proper to the bishops, the office of legates of the Roman pontiff be more precisely determined.
Source: Christus Dominus (Vatican.va)