The "trails", suggested by Bush, can be viewed as some kind of "superlink", connecting a whole series of nodes, rather than only two nodes. As long as you stay on such a guided tour, you can simply click on a "next node" anchor to move along the tour.
Guided tours are most useful for systems that provide information on different subjects, or that must guide the user through an information base, without too much initiative from the user's part. A system that contains information for museum visitors for instance should provide guided tours about different aspects of the museum's exhibitions. Hammond and Allinson coined the term "Travel Metaphor" [HA87], another term related to tourism.
Trigg [Trigg-88] extended the idea of guided tours for the NoteCards system by making each "stop" on the tour a set of cards, rather than a single node. An accompanying Tabletop tool allowed authors to create these stops on the tour.
Guided tours are difficult to maintain in a changing hyperdocument. Also, when the user wishes to follow a tour about a topic that is relevant but for which the author hasn't created a tour, the problem of finding a sensible path through the hyperdocument becomes very difficult. Guinan and Smeaton [GS92] designed an algorithm for dynamically creating guided tours as the answer to an information retrieval command. When asking for nodes about a certain topic, the algorithm generates a guided tour, containing the requested nodes, in a logical reading order, and containing the nodes with the highest score near the beginning of the tour.