When you start at a blank or partially complete slide, it is tempting to put that key message in. You don't have the overview of the entire presentation, so the key point will appear - duplicated - on many pages.

The same thing I often see happening on corporate web sites: multiple people make edits on different pages independent from each other.

The slide and the page on its own make sense, the overall story looks garbled and duplicated. 

If you liked this post, why not subscribe to daily updates about presentation design via email? Just blog posts, no spam, or you can follow Jan on Twitter to never miss a thing.