[Hypertext and expertext: how to navigate on an ocean of information]

Computers have made possible an explosive increase of information flow. In this ocean of information it becomes more and more easy to get lost. Computers again may provide answers to this problem. This article describes principles of small-volume hypertext, large-volume hypertext and expertext as up-to-date navigation tools for the beginning as well as the advanced skipper. In addition, it is argued that the orthodontist should take responsibility in guiding these developments on his or her domain. He can do this by getting acquainted with the possibilities and choosing the right software. Ultimately, technology should not be developed for its own sake, but for the benefit of orthodontists and their patients.