Teaching and Learning Aids: Overcoming Barriers

Abstract

The major purpose of audio-visual aids in the classroom is to focus attention. If you switch on an OHP, attention moves from your face to the screen. This helps by providing variety and regenerating interest — attention span is normally no more than fifteen minutes — but is obviously self-defeating if the OHP is then just left on. Use it only as needed; otherwise, it becomes ‘noise’. Students need to concentrate on you when you wish to engage them in two-way exchange.