Is regional cooperation feasible within Southeast Asia? The idea continues to have vitality, although most of the attempts to make use of the concept in this area have so far met with little apparent success. The Colombo Plan, SEATO, and the Bandung Conference are reminders only of the most prominent efforts to apply "regionalism" to the area. As early as 1947, the Burmese nationalist, Aung San, urged greater cooperation among Southeast Asian states, but his ideas had no lasting effect. And despite the many more formal proposals made since 1947, the area continues to be Balkanized. Yet today regional proposals seem to be proliferating and, for this reason, it is important that the obstacles to regional cooperation in Southeast Asia should be well understood. In 1961, the Association of Southeast Asia (ASA) was established, and the Malaysia plan, incorporating Malaya, Singapore, and the British Borneo territories, was put into effect in September 1963. In addition, and largely as a result of problems connected with the Malaysia proposals, "Maphilindo" was formed during June and July 1963. This is a loose consultative grouping of Malaya, the Philippines, and Indonesia. On a wider scale, there have been some proposals to organize an Asian Common Market; and the United Nations, through its Economic Commission for Asia and the Far East (ECAFE), seems to be urging certain forms of regional economic cooperation in Southeast Asia.1