"This issue of "Sound and Image" is entirely devoted to the use of audiovisual equipment in education and teaching — From the primary school to the university, from the apprentice workshop to the research laboratory, the teaching machine has proved that it complements and reinforces the work of teachers — Philips have asked a team of experts to describe the field of application and the advantages of programmed learning, closed-circuit television and the language laboratory — The experiments described show that these new teaching methods are of interest not only to young people, but also to adult artisans (permanent education) or scientific personnel (medicine, re-education of handicapped persons)." (Jean-Marie Van Bol, Abdelfattah Fakhfakh: The use of mass media in the developing countries. Brussels: CIDESA, 1971 Nr. 734, topic code 410.331.0)