REPORTED ARE THE ACTIVITIES OF THE CONGRESS ORGANIZED BY THE INTER-UNION COMMISSION ON SCIENCE TEACHING (CEIS) OF THE INTERNATIONAL COUNCIL OF SCIENTIFIC UNIONS (ICSU). STUDIED WERE PROBLEMS ARISING IN SEVERAL BRANCHES OF KNOWLEDGE DUE TO BOTH INCREASED NUMBERS OF STUDENTS AND SHORTAGE OF TEACHERS. OF PARTICULAR INTEREST WERE THE PROBLEMS OF DEVELOPING NATIONS. REPRESENTED AMONG THE 84 PARTICIPANTS WERE NINE AFRICAN STATES, THE UNITED STATES, FIVE ASIATIC COUNTRIES, AND NINE EUROPEAN COUNTRIES. AMONG THE DISCIPLINES REPRESENTED WERE (1) ASTRONOMY, (2) BIOLOGY, (3) BIOPHYSICS, (4) CHEMISTRY, (5) CRYSTALLOGRAPHY, (6) ECONOMICS, (7) GEOGRAPHY, (8) GEOLOGY, (9) MATHEMATICS, (10) MECHANICS, (11) PLANT PHYSIOLOGY, (12) PHYSICS, (13) ZOOLOGY, AND (14) VARIOUS OTHER FIELDS. REPRESENTATIVES PREPARED AND DISTRIBUTED TO THE GROUP PAPERS REPORTING TEACHING DEVELOPMENTS FOR EACH DISCIPLINE. SIX WORKING GROUPS WERE FORMED, AND REPORTS OF DISCUSSIONS AND RECOMMENDATIONS WERE PREPARED. THE MAIN TOPICS CONSIDERED ARE (1) SCIENCE INSTRUCTION AND ECONOMIC PROBLEMS, (2) IMPROVEMENT IN THE COORDINATION AMONG THE DIFFERENT BRANCHES OF SCIENCE TEACHING, (3) PRE-UNIVERSITY INSTRUCTION IN SCIENCE AND THE EDUCATION OF TEACHERS, (4) TRAINING OF TECHNICIANS, AND (5) TEACHING CONCERNING NATURAL RESOURCES. NAMES AND ADDRESSES OF PARTICIPANTS ARE GIVEN. (DH)