... keywords into a search text fi eld. In addition, let users search for key phrases by enclosing keywords within quotes; when searching for key phrases, users are shown results containing the exact ... select the “ Airline, fi rst or business class, … ” link under “ Additional options ” (b). (a)(b)CHAPTER 6 Searching and Filtering152 Why No matter how well designed the search engine, users ... occur later in the sequence. For example, in an e-commerce checkout process, shipping information usually comes before payment infor-mation because the shipping address and shipping options...