The rules were adopted in September 1985 by a UN Congress. The terminology they use is cautious as well as general, focusing on the objective of promoting the well-being of juveniles. The terminology also assumes the existence of a juvenile justice system. In addition, diversion is presented as a general concept rather than a specific practice. A variety of possible dispositions are mentioned, but the list is not intended to be exhaustive. Institutionalization is described as a last resort. Implementing the rules in individual nations will entail some of the same difficulties that formulating them did. Each nation will have to develop specific interpretations of terminology and decide how to balance firmness and flexibility in the rules. The UN intended the rules as a model for its member states. The existence of such rules does represent progress in the direction of a world law, in that they provide a set of minimum guidelines for national policies.