When was this written? I don't see a date, but the phrasing suggests he's discussing slides printed on transparencies, rather than PowerPoint/Keynote/etc. To t

When was this written? I don't see a date, but the phrasing suggests he's discussing slides printed on transparencies, rather than PowerPoint/Keynote/etc. To the author's credit, almost all of this advice is still relevant, but here's a nit: for academic work, if you have a series of steps to reveal to the audience, the "peek-a-boo" style is fine. It's only cheesy if you actually have to lay a piece of paper over the transparency and physically slide it down. (For more persuasion-oriented presentations, it's still better to avoid text-heavy itemized lists altogether.)