Good teaching applications are also built around a strong central narrative, but they typically offer more opportunities to pursue interesting digressions from the main themes of the Web site. The information presented is usually more sophisticated and in-depth than in training applications. Links are the most powerful aspect of the Web, but they can also be a distraction that may prevent visitors from getting through the presentation. If you wish to provide links to other Web-based resources beyond your local site, you might consider grouping the links on a separate page away from the main body of the material. Often readers will want to print material from a teaching site and read it later from paper. Make this easy for them by providing a "printing" version that consolidates many separate pages into one long page.