The overhead projector, or OHP, is a commonly used tool in education despite challenges from data projectors. While data projectors are better for rehearsed presentations, OHPs are more flexible. When using an OHP, it is important to focus the image before class starts and not get in the way of students' views. Presenters should use a pen to point at the OHP stage rather than the screen to avoid shadows. OHTs should be switched between topics to avoid distraction.

1. THE OVERHEAD PROJECTOR (OHP)

2. The Overhead Projector, or “OHP” is one of the most frequently used (and misused) tools in education and training today. It may be facing a challenge from the data projector, but it is still more flexible and useful for all except uninterrupted, rehearsed presentations. Using the OHP in class

3. Tipsfor use1.Get the OHP set up for optimumimage size, focused, etc. before the class starts. Make sure everyone can see. 2.Once you are sure of the above, you have no need to look at the screen. You can concentrate on the class. Needless (?) to say, don't get in their way.

4. 3.So do not point to material on the screen itself. Use a pen or other pointer on the stage of the OHP. If your hand is at all shaky, lay the pointer down on the OHP stage. Standing in front of the screen to point out salient topics:*means that you are tempted to talk to the screen and not the class *means that some of the image is projected onto you, and there is a large obscuring shadow on the screen

5. 4.The only exception is when you are projecting onto a whiteboard, and writing/drawing on the board to elaborate on the image. Even this can usually be dealt with more effectively by writing on an overlaid transparency on the OHP stage.

6. 5.Do not leave an old OHT showing when you have moved on to talk about something else. Switch off between OHTs, or at least between sequences.