Slides should be one wherein each time, such as one page with one of the issues, but if you want populated. Several issues in one page to display individual issues, so, constant attention to the audience what the presenter is talking. If the audience sees other issues or issues in advance will make listeners not interested in what you're listening to. Such a technique called gradual revelations to control concentration of listeners, is in accordance with the procedure of presenting images and listen to narration, respectively. This technique can be applied to a slide presentation that is a short list, it should show up as individual lectures. It should not be shown with every line because it will make people listen to blurry, but interesting to read, or rather interested in listening. In addition, each item should end in the same line and is between six to eight words in the English language, or no more than ten words in the dialect of Thailand and should not exceed 6 items on each page. Or, if a line should not exceed 8-10 lines in each of the slides.
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