Instructional aids: are devices that assist an instructor in the teaching-learning process. Instructional aids are not self-supporting; they are supplementary training devices. The key factor is that instructional aids support, supplement, or reinforce.
Instructional aids help students remember important information. And when properly used, they help gain and hold the attention of students. Audio or visual aids can be very useful in supporting a topic, and the combination of both audio and visual stimuli is particularly effective since the two most important senses are involved.
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