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ABOUT THE CONTRIBUTORS

president of International Institute of Philosophy 1960-1963, doctor honoris causa of numerous Polish and foreign universities, member of many Academies of Science abroad. Founder of Polish school of praxiology, the last repre-sentative of world known Polish school of logie, one of the greatest Polish philosophers; fields of interest not only logie and praxiology but ethic, ontology, gnosiology, epistemology, methodology, pedagogy too. Main publi-cations in foreign languages : Leęons sur 1’histoire de la logiąue (Warsaw-Paris 1965-1971), Gnosiology. The Scientific Approach to the Theory of Knowledge (Oxford-Warsaw 1966); ‘ Ce qu’il-y-a d’essential dans 1’appreciation morał In : Library of the Tenth International Congress of Philosophy, Vol. 1, Pro-ceedings of the Tenth International Congress of Philosophy, Amsterdam, August 11-18 (Amsterdam 1948); ‘Sur 1’attitude reiste (ou concretiste)’, Synthese Bussum, 1948-1949, V. 7, Nos. 4-5, pp. 262-273); ‘The Fundamental Ideas of Pasomatism ’, Mind, Edinburgh 1955, V. 64, No. 256, pp. 488-500; ‘ Sur 1’attitude róiste ou concretiste ’, In : Le language (Actes du XIIl^e Congres des Socińtós de Philosophie de Langue Franęaise) Neuchatel, 1966, pp. 100-102.

OSKAR LANGE (1904-1965) studied economics and mathematical statistics at the Universities of Poznań and Cracow (Jagiellonian University), 1928 Ph.D. (Economics), 1934-1935 in the USA and England — among others Cambridge Mass., London School of Economics, Oxford, Cambridge (Rockeffeler Foundation^ scholarship). 1934-1945 professor at U.S. universities (Michigan, Chicago, Illinois, California, Stanford, Columbia, N. York). 1945-1948 Polish ambassador to the USA and the United Nations Organization. Professor at the Central School of Planning and Statistics in Warsaw, Warsaw University, Institute of Social Sciences of the Polish United Workers Party (PZPR). Member of the Polish Academy of Sciences, Econometrics Society, Institute of Social Studies (the Hague), Royal Statisticał Society. Politician — chairman and later vice-chairman of the State Council (Rada Państwa), member of the Central Com-mittee of the Polish United Workers’ Party. Actively engaged in resolving the country’s economical problems as chairman of the Economical Council of Poland and economic adviser to the governments of India, Ceylon and Arabian Countries. For his achievements in the field of political economics received national prizes in Poland (1955, 1964). Author of books translated and used as manuals in many countries. In English: On the Economic Theory of Socialism (Minneapolis 1938 and 5 later editions); Price, Flexibility and Employment (Bloomington Indiana 1944); Political Economy (Oxford, Warszawa 1963, V. II, 1971); Introduction to Econometrics (Oxford, Warszawa 1962); Wholes and Parts (Oxford-Warsaw 1965).

EDWARD LENIEWICZ (b. 1934) studied philosophy at Warsaw University, lecturer of logie (Ph.D. 1970), research fellow in Praxiology Dep. of the Institute of Philosophy and Sociology of the Polish Academy of Sciences, former managing editor of Prakseologia and Praxiology. Engaged in develop-ment of praxiology and theory of events.