Retrieval System, in To Improve Learning. An Evaluation of Instructional Technology, ed. by Sidney G. Tickton, Vol. 1 (New York: R.R. Bowker, 1970). 2For information about the technical aspects of VTR, see Grayson Mattingly and Welby Smith, A Layman's Guide to Videotape Recording (New York: Charles Scribner's Sons, 1973). 3For an interesting account of the integration of such video productions into a course for beginners, see Rainulf Stelzmann, German Sketches on Videotape in the Language Lab, UP, 6, No. 1 (1973), 25-28. 4For a description of the uses of VTR during rehearsals, see Rudolf Denk, Vom Regiebuch zum Inszenierungsversuch mit dem Videorecorder, Deutschunterricht 25 (1973), 129-142. sSee Herman U. Teichert, Commercials on Videotape, UP, 7, No. 1 (1974), 92. 61n his article, Vorschlag zu einer internationalen Videothek. Neue Moglichkeiten der Information und der Kommunikation in der Germanistik, UP, 5, No. 2, (1972), 51-53, J. M. Zemb proposes the establishment of collections of videotaped lectures by important Germanists.