The article presents the achievements of the International Committee for the Investigation of Folk Culture in the Carpathians (MKKK), an international and interdisciplinary institution established forty years ago. First contact was made between the scholars of IHKM PAN (Poland) and Národopisny Ústav SAV (Slovakia) in 1958, followed by joint research projects conducted with other countries (Romania, Soviet Union, Bulgaria, Hungary, Yugoslavia). In 1976, in view of the extended territory (research comprised also the Balkan countries), the name was changed to the International Committee for the Investigation of Folk Culture in the Carpathians and Balkans (MKKKB). In 1993 the original name was reinstated. The article discusses the first years of MKKK, and the three most important research projects, identified for international synthetic study: the traditional folk architecture, high mountain pasturing and the folklore of highland robbers. The author describes the work of the international teams, the organizational structure of MKKK, the most important conferences and the results of the work of international teams, provides information about publications and subsequent projects. In the following part the article carries information about the work and structure of the Polish Committee, establishment of a museum sub-committee, an ethno-musicological team, and a team for the preparation of 'Prokes', a computer database. The article also carries information about the resumption of the Committee's work in 1993, at the international conference organized and held in Lvov, after an interruption caused by political, economic and social changes that have taken place in the member states.