Developing usable and desirable products requires an understanding of how users build close relationships with objects and how these relationships can be controlled by developers. This paper discusses the importance of the concept of affordances as an instrument useful for understanding the relationships between technical functions and user tasks. The approach introduces a Function-Task Design Matrix to link technical functions with user tasks and to capture relevant affordance-level requirements throughout the product architecture generation. Functional and Operational Affordance levels are introduced to help determine the product attributes necessary to optimize the ease with which users can undertake technical functions. The paper uses functional language, focusing attention towards the use of the product, rather then merely its workings. The tools for describing affordances are described first, followed by a step-by-step description of how they can be used to improve decisions during product architecture generation. The mechanism is illustrated in a case study on a kitchen appliance.

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The intention of this paper is to review the Function-Task-Interaction methodology and tools, which have been developed to link product functions and users' tasks and to incorporate the concept of product affordances in product architecture development. This paper also aims to present the results of two investigations. The first was field research conducted with end users to assess their mental models of specific product architecture and related functions; the second was an investigation conducted with design experts from a global manufacturer of mobile communications products. Finally, this paper strives to expand the proposed methodology by introducing a new set of questions and a user-centric vocabulary for representing aspects of user-product interaction in Functional Modeling. The authors argue for the development of a controlled vocabulary to describe and label affordances.