You can create your visuals using a copier and a typewriter. The quality of transparency images has increased dramatically, thanks to the innovations of high resolution inkjet printers. Easy to see Overhead projectors project images that are bright enough to see in a well-lit room. Wide availability Most offices, schools, etc. have overhead projectors. Presentation customization Presentations can be reordered manually to create a custom presentation quickly.
Transparencies are fragile Presenters have to be extremely careful with transparencies.
They crumple, scratch, and tear easily. Presenters who travel find they don't last long on the road. Manual process of changing transparency slides Presenters are tied to the overhead projector because they are forced to manually change their slides. Noise factor Overhead projectors are loud and can be a challenge to talk over. Keystoning Overhead projectors are notorious for bad keystoning which can distract an audience from the presentation.