| Summary: | For a long time now, the activity-centered approach to ergonomics has been showing operators´ inventiveness in industrial situations. In terms of design, this position opens up a new field: on which grounds can one articulate ´design at work´ and ´the work of design´? In this paper, the reasons why designing continues during use are discussed. Against this background it is argued that design is a development process encompassing both the artifact and the way it is used (the form of action). It is precisely that coming together of artifact and use, here defined as ´instrument´, which is necessary for design. On this conceptual basis, a dialogical model of design is proposed. From this model´s ´instrumental hypothesis´, different forms of organizing the design process are proposed and illustration is provided.
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