The very complexity of the system and the extraordinary diversity of, and often apparent lack of coherence in, its activities, are themselves sources of frustration, as is the sense among the major contributors that the regular budgets, and the programmes financed under those budgets by mandatory assessments, escape their control. Furthermore, frustration has been voiced, with different emphases by different groups of countries, because of the lack of cohesion within the UN itself and the various parts of its Secretariat; the proliferation of intergovernmental organs, many with overlapping mandates and almost all of unmanageable size; the proliferation of highly independent voluntary trust funds for purposes not necessarily corresponding to established high priorities; the soaring budgets for tasks which may not always be well considered from the standpoint of cost, benefit or coordination; the quasi-impossibility of comparing and therefore of coordinating the future plans of different agencies; the involvement of so many agencies, including organs of the UN itself, in almost every undertaking; the independent public information and public relations offices of each agency and most of the UN programmes; the 'jungle' of UN and agency regional and subregional structures which makes system-wide action at those levels so difficult, the over-frequent and un-coordinated visits by officials of different organizations to the capitals of developing countries; and the considerable time and effort which the multifarious coordinating processes seem to require. Underlying such complaints, but partly independent of them, is the concern about the increasingly fragmented character of the system and the possibility of further fragmentation in very important fields such as population, food, and the resources of the sea-bed and ocean floor.