THIS VOLUME CONTAINS SIX CASES ON THE USE OF TELEVISION, RADIO, AND COORESPONDENCE STUDY--ALONE OR IN COMBINATION--FOR INSTRUCTION. EDUCATIONAL EXTENSION, AND ADULT EDUCATION AND COMMUNITY DEVELOPMENT IN AMERICAN SAMOA (ETV), USA (HAGERSTOWN ETV), THAILAND (EDUCATIONAL RADIO), JAPAN (ETV AND CORRESPONDENCE), AND AUSTRALIA (RADIO AND CORRESPONDENCE). MOST CASES WERE PREPARED BY A TEAM INCLUDING USUALLY AN EDUCATOR, MEDIA SPECIALIST, AND ECONOMIST, WHO PRESENTED THE HISTORY, ORGANIZATION, OPERATION, COSTS, AND EVIDENCE OF EFFECTIVENESS FOR EACH PROJECT. IN EACH CASE, TABLES AND GRAPHS PRESENT THE EVIDENCE AVAILABLE TO THE EFFECT THAT LEARNING DOES TAKE PLACE AND THAT THE NEW MEDIA, WHILE THEY ENTAIL HIGHER COSTS, CAN BRING DOWN UNIT COSTS, DEPENDING ON HOW MANY PEOPLE ARE REACHED. DIFFICULTIES IN PLANNING, ORGANIZATION AND SUPPORT, PRODUCTION, RECEPTION, AND FEEDBACK ARE NOTED, DISCUSSED, AND PERTINENT RECOMMENDATIONS PRESENTED. NOT UNEXPECTEDLY, DEVELOPING COUNTRIES TEND TO HAVE MORE DIFFICULTIES--THESE ARE TRACED TO TECHNICAL AND FINANCIAL CONSTRAINTS. THEY ALSO TEND NOT TO BENEFIT FROM THE ECONOMIES OF SCALE IN THE USE OF THE NEW MEDIA. THIS DOCUMENT IS AVAILABLE AS A.2285 FROM UNESCO, PLACE DE FONTENOY, 75 PARIS-7E, FRANCE, FOR $4.50. (GG)