Dinckel and Parnham (1985) say that "The great danger (in using visual aids) is that presenter place major emphasis on it and relegate themselves to the minor role of narrator or technician, your explanation, your conviction and your justification". Visual aids can make information more memorable and they help the speaker. However, they must literally support what the speaker says and not simply replace the spoken information. It is also not enough to just read text from a visual aid.
There are many advantages to the correct use of visual aids. They can show information. Which is not easily expressed in words or they can highlight information. They cause the audience to employ another sense to receive information, they bring variety and therefore increase the audience's attention. They save time and they clarify complex information.
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