Sorry the page you are looking for, /chapters/www.hcibook.com/e3/chaps/www.hcibook.com/e3/chaps/www.hcibook.com/e3/chaps, has not been found.
You may have typed the url wrong ... or we may have not finished a page yet :-(

Instead try looking at list of chapters at www.hcibook.com/e3/chaps/

Alternatively try the HCI Book /e3/ home page