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To design proactive and autonomous interactive objects, designers deal with the design of the object's behavior. In this paper, we propose a design method, called Personality, to help designers develop interactive objects' behaviors with a focus on aesthetics of interaction; the method focuses on tangible and bodily interaction, and it includes four main steps. The "unguided improvisation" step consists of an initial interplay with the interactive object in order to size up the interaction; a brainstorming step, in which we use stereotypes of personalities to create metaphors, to support the discussion around, and the description of, possible behaviors; the "guided improvisation" step iterates over several improvisation sessions to act out interaction scenarios and behaviors; and the behavior synthesis step, in which we provide a final description of the object's behavior. To illustrate Personality we will describe the sofa-bot case study. We will report a lab study, in which we observed people reaction to the different behaviors of the sofa.
Spadafora et al. (Sun,) studied this question.