32 It would also be good to coordinate the activities which are being carried on by ecclesiastical institutes and associations. All these, of whatever kind, should defer to the local Ordinary in all that concerns missionary activity itself. Therefore, it will be very helpful to, draw up contracts to regulate relations between local Ordinaries and the moderator of the institute. When a territory has been committed to a certain institute, both the ecclesiastical superior and the institute will be concerned to direct everything to this end, that the new Christian community may grow into a local church, which in due time will be governed by its own pastor with his clergy. When the commission of a certain territory expires, a new state of affairs begins. Then the episcopal conference and the institutes in joint deliberation should lay down norms governing the relations between local Ordinaries and the institutes. It will be the role of Holy See to outline the general principles according to which regional and even particular contracts are to be drawn up. Although the institutes will be prepared to continue the work which they have begun, cooperating in the ordinary ministry of the care of souls, yet when the local clergy grows numerous, it will be provided that the institute, insofar as this is in agreement with its purpose, should remain faithful to the diocese, generously taking over special works or some area in it.
Source: Ad Gentes (Vatican.va)