SEM-HP is a model for the development of evolutionary and adaptive hypermedia systems by means of: a development process that consists in iterative and evolutionary phases; a layered architecture that captures each phase in subsystems divided into two levels of abstraction (system and metasystem); and an author tool that implements the model. The paper focuses on the capability of adaptation of the hypermedia systems developed according to the SEM-HP model, in particular, the learning subsystem that is in charge of performing the user adaptation. SEM-HP offers two important contributions: supporting the process of evolution of the development of adaptive hypermedia systems, ensuring easy, flexible and consistent maintenance; and the orientation support is that inherent to the navigational structure itself.

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Hypermedia systems are evolutionary in nature. This paper presents SEM‐HP, a model based on a semantic, systemic and evolutionary perspective, which facilitates the management of hypermedia evolution during the whole lifecycle process. Following the model the architecture of hypermedia systems can be conceived as composed of three sub‐systems (conceptual, presentation and navigation) and two abstraction levels, the system level and the meta level (the first used by the reader and the second by the designer). The objective of this division is to achieve a good separation of concerns both in the development and in the evolution processes and to obtain a better understanding, thus facilitating the further development of tools. Copyright © 2002 John Wiley & Sons, Ltd.