Its editorial board looks at every site that is submitted for inclusion in its data base. Sites are screened out if they fail to meet Magellan's standards. For instance, it will not index hate groups or pages that it deems to be pornographic. A rating system is also employed to identify high quality Web sites. You can also search a highly restrictive database of green sites that are screened for children to view.
Topical listings are also available for browsing.
Webcrawler uses the AND or NOT variety of boolean operators. However, the principle strength of Webcrawler is the ease of browsing its set of topics. Click browse on the toolbar at the top of the page to see the range of topics. Then you can refine your search by searching within each topics. Suppose you wanted to give your speech about the movement for home schooling.