The tremendous potential of videodisc technology makes learning about this medium and its use a necessity for all educators. An overview describes video frames, videodisc formats, and visual display options. The three different levels of interactivity used to refer to the delivery of videodisc programs are outlined; they offer various amounts of control and require different hardware configurations. The instructional strategies employed in videodisc programs are: movies and documentaries, tutorials and instructional lessons, instructional games, visual databases, multimedia libraries, demonstrations, inquiry, simulations, and video report makers. Evaluation results from a study of 21 videodiscs for science and mathematics undertaken at the University of South Florida (Tampa) and the evaluation form are presented; highlights include instructional materials; frames, chapters and barcodes; content areas; and instructional strategies. Sample barcode activities are also provided. Appendices contain the names of the programs evaluated, videodisc resources, and the barcode activity answer key. (AEF)