Optical videodiscs can store more than 50,000 full-color images or framepictures in analogue form, as well as analogue sounds on audio tracks and largeamounts of text as digital data. Full video motion is achieved by playing 25 or30 frames a second, depending on the standard used. Interactive videodiscsystems are computer-controlled and allow the user to move easily from onesegment to another according to the options and instructions programmed in bythe instructional designer. Interactive videodisc technology has not becomewidely used, as a result of the lack of standardization across systems, thepaucity of educational material in this form, and the advent of lower-costmultimedia authoring software. CD-ROMs used with personal computers do a similarjob for a lower cost.
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