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Concerns about human-machine interaction are becoming one of the most important thrusts for the development of innovative and successful products. Interaction design methods and tools are already described in literature and available for designers, and the analysis of their characteristics suggests the synergy with other research fields aimed at developing an interaction design framework as complete as possible. The complementary aspects of the inventive problem solving theory named TRIZ were considered, and the linking was done thanks to the structured approach to information gathering of the house of quality, one of the data structures in the quality function deployment (QFD) design method. The result is the interaction design guidelines (IDGL), a framework implemented in a Microsoft access database that supports designers starting from collecting users’ needs up to the generation of design solutions. This paper describes the IDGL development, together with a first adoption in the field and a validation of the process and results. © 2014, Springer-Verlag France

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One of the main limitations in subject-centred design approach is represented by getting 3D models of the region of interest. Indeed, 3D reconstruction from imaging data (i.e., computed tomography scans) is expensive and exposes the subject to high radiation doses. Statistical Shape Models (SSMs) are mathematical models able to describe the variability associated to a population and allow predicting new shapes tuning model parameters. These parameters almost never have a physical meaning and so they cannot be directly related to morphometric features. In this study a gender-combined SSM model of the human mandible was setup, using Generalised Procrustes Analysis and Principal Component Analysis on a dataset of fifty mandibles. Twelve morphometric features, able to characterise the mandibular bone and readily collectable during external examinations, were recorded and correlated to SSM parameters by a multiple linear regression approach. Then a cross-validation procedure was performed on a control set to determine the combination of features able to minimise the average deviation between real and predicted shapes. Compactness of the SSM and main modes of deformations have been investigated and results consistent with previous works involving a higher number of shapes were found. A combination of five features was proved to characterise predicted shapes minimising the average error. As completion of the work, a male SSM was developed and performances compared with those of the combined SSM. The features-based model here proposed could represent a useful and easy-to-use tool for the generation of 3D customised models within a virtual interactive design environment.