Adaptivity is one of the key properties of current and future computer systems to make them more easy to operate, more efficient, and better accessible to a wider audience. By extending both the reach and the effectiveness of systems, adaptivity is nowadays a decisive business factor. A system's adaptivity requires a certain knowledge about the human user. The knowledge typically is incomplete and insecure. Reflection goes even further; it is some novel ability. Reflective system are pondering the reliability of hypothetical knowledge and act more sensitively. This contribution introduces reflection into adaptivity.
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