Part of designing the User Virtual Machine is designing the interaction between the user(s) and the system. There already exist several techniques for designing the interaction, but, once applied in practical situations, all have problems. The use of a formal comparison method combined with experience in interaction design shows that there exists a conceptual basis for interaction design. The method to find this basis is a structured approach which describes each technique objectively, compares

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... the concepts, relations, purposes, and places in the design method. Based on this comparison the conceptual basis for interaction design can be created, which is adaptable to the design situation at hand.