Since my first attempt in 1996, I have compiled many top-10 lists of the biggest mistakes in Web design. See links to all these lists at the bottom of this article. This article presents the highlights: the very worst mistakes of Web design. (Updated 2011.)
1. Bad Search
Overly literal search engines reduce usability in that they’re unable to handle typos, plurals, hyphens, and other variants of the query terms. Such search engines are particularly difficult for elderly users, but they hurt everybody.
A related problem is when search engines prioritize results purely on the basis of how many query terms they contain, rather than on each document’s importance. Much...