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achieve adult education advice Africa agencies agricultural answer the question Asia version asked audiovisual aids authoritative believe cent shown closed-circuit television community development demonstrations development projects development worker discussion Documentary films employed example excluded experts National experts face-to-face factors favour felt needs findings foreign and national Foreign experts National foreign informants foreign sample groups home economics important index of severity informants for Asia initial strong resistance intermediaries interview introducing social change latest projects Latin America leaders least effective less mail questionnaire major mistakes mention method and approach Middle East modern national government national informants number of informants opinion people's percentage persons persuasion population problems procedures programme project sphere recent projects region relatively replies reports responses risky score selective approach Severe Moderate social development specific staff strategy study countries study tours sub-Saharan Africa survey Table techniques Total number types utilization village