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Optical videodiscs can store more than 50,000 full-color images or frame pictures in
analogue form, as well as analogue sounds on audio tracks and large amounts of text as
digital data. Full video motion is achieved by playing 25 or 30 frames a second, depending
on the standard used. Interactive videodisc systems are computer-controlled and allow the
user to move easily from one segment to another according to the options and instructions
programmed in by the instructional designer. Interactive videodisc technology has not
become widely used, as a result of the lack of standardization across systems, the paucity
of educational material in this form, and the advent of lower-cost multimedia authoring
software. CD-ROMs used with personal computers do a similar job for a lower cost.
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