HELENA: A shell for creating educational hypermedia applications

An authoring system HELENA for creating hypermedia applications is described. It is based on frame knowledge representation approach and knowledge structure visualization techniques. Four educational application areas of a hypermedia authoring system and applied hypermedia systems are discussed. These areas include descriptive learning environments, systems for supporting decision making, guided documentary design systems, and cognitive tools. The propositions for further development of the authoring system and the list of open questions for further research are described.