<<How can a book be busy?>> In the same way a painting can be "busy"; that is, there's too much going on with it for any focused clarity to take place. In much the same way as a song can be "busy", too many players, overarrranged, etc. I would think it's EASY for a technical manual to be Busy and cluttered and not user-friendly. I would say most of them are probably this way.
Bob
