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The argument for adaptivity in a system is developed and related to previous theoretical work on adaptive interface design. We attempt to integrate recent research findings with practical experimental trials to provide a new formalism for system adaptivity. The experimental vehicle is a small CBT/tutoring system which incorporates embedded models of individual characteristics and student information in the form of ‘stereotypic’ attributes and user profiles. We describe the system characteristics and operation, give our experimental results and detail future planned work. We discuss some of the implementation difficulties already encountered and those which we expect to be apparent in future systems.