A detailed account is given in this paper of the procedures and the equipment used in producing six computer-animated instructional movies. First, the sequence of events were described in a script, which, together with the analytical expressions that were dealt with, formed the basis of a program. Then, the program was run on a computer and the output stored on a magnetic tape. The information on the magnetic tape was transferred to an oscillograph screen with the help of a digital-analog converter. From the oscillograph screen, the pictures were photographed with a movie camera. After development and cutting, the film was ready for showing. The movies were chiefly about antennas. A next step, that is considered to be very simple, is to add sound to the movies. (MF)