The chalkboard allows unlimited flexibility and spontaneous modification. One problem is that it is too often used as a substitute for greater creativity and preparation on the part of the speaker. The speaker should not address the audience while writing on the board. Write neatly and large enough for the entire audience to see. Electronically Enhanced Visual Aids Overhead transparencies .
Overhead transparencies are an effective and commonly used visual aid.
They can be used in large and small meetings that are formal or informal. 35mm slides . Slides represent an easily manageable and elegant visual format. Slides allow you to bring realism into your presentation. Videotape should be used when teachers want to present information that entails moving video.