"The present study contains a certain number of articles on the production and use of visual aids, in particular films made by specialists whose experiences cover very different countries: Egypt, Morocco, West Africa, East Africa, the former Belgian Congo, the Gold Coast, China, India, Malaysia, Papua and New Guinea, Venezuela, Jamaica, etc. — In the introduction the Secretariat of Unesco has attempted to establish a link between the problems and the controversies in order to assist the reader." (Jean-Marie Van Bol, Abdelfattah Fakhfakh: The use of mass media in the developing countries. Brussels: CIDESA, 1971 Nr. 2409, topic code 520)