"Analysis of the audio-visual aids used by the Group of Industrial Productivity Study (GEPI) of the Engineering school of the state of Rio de Janeiro (Brazil), mainly films, equipment and data concerning studies on quality control, audio-visual aids illustrating the assembling of machines, etc. — The author stresses the fact that the nature of the courses given to the future engineers demands the intensive use of audio-visual aids in order to gain the interest of the students and enable them to follow and understand the courses better. [Working Paper, 18 Oct. 1962. Contribution to: The United Nations Conference on the Application of Science and Technology for the Benefit of the Less Developed Areas, Geneva, 4 to 20 February 1963. E/Conf. 39/K/45. Agenda Item: K.2.4]" (Jean-Marie Van Bol, Abdelfattah Fakhfakh: The use of mass media in the developing countries. Brussels: CIDESA, 1971 Nr. 1704, topic code 50)