APPLYING QUALITY HYPERMEDIA DESIGN PRINCIPLES TO A WEB-BASED EDUCATIONAL SYSTEM

摘要

We present a web-based educational system modeled using hypermedia design principles. The design establishes two interrelated and interacting layers: a data storage layer and an adaptation layer, linked by the user model. The data storage layer is structured in a data level and an object level. The first level is responsible for maintaining a relational representation of all data, and the second one converts data from the relational schemes into object oriented structures, used out of the storage layer. The adaptation layer performs an adaptive process in two levels: contents and presentation. The former decides what must be shown and depends on the user's capabilities, while the latter determines how it must be shown and depends on the user's preferences. Moreover, the system uses dynamic role assignments based on users' capabilities.