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A hypermedia application offers its users much freedom to navigate through a large hyperspace. Adaptive Hypermedia (AH) offers personalized content, presentation and navigation support. Many Adaptive Hypermedia Systems (AHS) are tightly integrated with one specific application and/or use a limited number of techniques and methods. This makes it difficult to capture all of them in one generic model. In this paper we examine adaptation questions stated in the very beginning of the adaptive hypermedia era and elaborate on their recent interpretations. We will reconsider design issues for application independent generic adaptive hypermedia systems, review open questions of system extensibility introduced in adjacent research fields and try to come up with an up-to-date taxonomy of adaptation techniques and an extensive set of requirements for a new adaptive system reference model or architecture, to be developed in the future.

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Mobile learning and testing is emerging as a potential educational environment. In this article we evaluate the use of mobile devices for testing as compared to web-based assessment systems. We also describe an authoring tool to develop adaptable and adaptive computerized tests that can be executed on such different platforms as personal computers, personal digital assistants and mobile phones. We have carried out an experiment with computer science university students to determine their satisfaction and to compare the results obtained when executing a test on personal computers versus mobile devices. The experiments have shown that students were highly motivated and enjoyed using mobile application for testing. Furthermore, there were not any significant differences in the results obtained with the different versions of the test. ß

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