“(…) we lured him into our usability lab to look at the user interface for Answerbook, of which were were very proud. (…) He played with our AnswerBook for about 90 seconds, turned around, and pronounced his review: ‘Dr Spock’s Baby Care is a best-selling owner’s manual for the most complicated ‘product’ imaginable — and it only has two levels of headings. You people have 8 levels of hierarchy and I haven’t even stopped counting yet. No wonder you think it’s complicated.'” (Sun.com Design, Usability & Other Stuff) – courtesy of jasonkottke