Adaptive design of physical, hand-operated interfaces for the transgenerational user using parameterization

Abstract

This paper presents initial work packages of a research project funded by the German Research Foundation (DFG) concerning age-appropriate, user-centered design of physical human-machine interfaces (HMIs). To facilitate indi-vidualization of physical human-machine interfaces, it is essential to describe their gestalt precisely by means of quantifiable design parameters. So far, this has not been done in such a way as to support designers and engineers effectively in their task of making the transition from conceptual ideas to physical, user-centered interfaces. A holistic design parameter model of physical interfaces is elaborated within this paper. Furthermore, a methodical approach for adapting the machine’s design parameters to the skills of an older user is presented using the example of rotary control elements. This is based on a literature review and a subsequently conducted expert survey. Furthermore, corresponding compensation options by means of adjustments to the machine’s design parameters are discussed. To this end, the results of two preliminary user studies are presented which simulate a fine motor adjustment task and a forceful gross motor task. This in turn leads to an initial adaptive design for a rotary control element. Finally, an outlook regarding the next steps of the research project is given, whereby various design parameters are to be evaluated and assessed with regard to their suitability for adaptive adjustment.