§1. In individual institutes the formation of all the members is to be continued after first profession so that they lead the proper life of the institute more fully and carry out its mission more suitably.
§2. Therefore, proper law must define the program of this formation and its duration, attentive to the needs of the Church and the conditions of people and times, insofar as the purpose and character of the institute require it.
§3. Universal law and the program of studies proper to the institute govern the formation of members who are preparing to receive holy orders.
Source: Code of Canon Law (Vatican.va)