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The paper aims at exploring the opportunities for improving the Human Computer Interaction (HCI) of Computer-Aided systems for supporting designers in carrying out the early stages of the Product Development Process (PDP). In details, the authors stem from the analysis of the latest advancements and issues in the field of Question and Answer techniques, which they have already implemented in algorithms for supporting the analysis of inventive problems. According to the analysis, they identify two basic directions to improve the HCI in such systems. Literature evidences concerning the different approach of designers according to their experience point out the need of producing more flexible systems, tailored for both skilled individuals and novices. Moreover, the need emerges to both foster creativity with meaningful stimuli and introducing pictorial communication within a dialogue flow, so as to follow the common cognitive path emerged by the analysis of design protocols. The discussion shows that...

Question/answer techniques within CAD environments: An Investigation about the most Effective Interfaces