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This position paper presents a novel method for modelling adaptivity in hypermedia design specifications. The method is based on an approach for designing adaptive hypermedia that integrates adaptivity in the structure of the system, recognizing some objects as adaptors and developing heuristics based on what the content and functionality may adapt. The heuristics are captured in so-called shadows that may hide the potentially complex underlying algorithms from the designer. The method is intended to complement existing methodologies, such as OOHDM, which currently lack means for visualizing adaptivity aspects. An user-modelling centric example is presented, accompanied by an implementation on-line for the interested to try. Current limitations and directions for future work on the method are recognized.