“…Depending on the level of user knowledge about the concepts presented in a particular fragment, the system can hide the fragment from the user (De Bra & Calvi, 1998;Stern & Woolf, 2000), shade it (Hothi et al, 2000), or choose one of several alternative ways to present it (Beaumont, 1994). One of the problems in fragment-based content adaptation, especially in its versions which hide some part of the page from users, is the lack of control from the user side.…”