Interaction Design Using a Child Behavior-Geometry Database Hiroyuki Kakara 1,2 , Yoshifumi Nishida 1 , and Hiroshi Mizoguchi 1,2 1 Digital Human Research Center, National Institute of Advanced Industrial Science and Technology, 2-3-26 Aomi, Koto-ku, Tokyo 135-0064, Japan 2 Department of Mechanical Engineering, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 278-8510, Japan Abstract. Unintentional injuries, that is, injuries due to accidents, ac- count for a large share of the cause of death in children. Some accidents can be prevented by designing products that are based on an under- standing of the interaction between children and the object. Improving products to prevent injuries requires a system that helps product design- ers predict the behavior that the object induces in children. In this paper, we developed a behavior-geometry database that consists of 1) data on children’s behavior with common objects, 2) for various objects, data from 3D shape models for which the feature vectors are calculated by a 3D discrete Fourier transform, and 3) two kinds of models for using a 3D shape-feature vector to predict the induced behavior, the barycentric behavior model and the multiple linear regression model. We also de- veloped the following behavior-symmetry-search functions that use the database: a) a shape-similarity search, b) an induced-behavior search, which is a function for predicting the behaviors induced by an object’s 3D shape, and c) a behavior-symmetry search, which is a function for finding objects that induce behaviors similar to those induced by the shape of a target object. The third function is useful for finding shapes that are similar in terms of inducing child behavior. In this study, we evaluated the effectiveness of the implemented system using data from 275 accidents and 3D shape data from 45 objects. Keywords: Injury prevention, interaction design, safety, 3D object re- trieval. 1 Introduction Unintentional injuries, that is, injuries due to accidents, account for a large share of the cause of death in children. According to the National Vital Statistics Reports 2012[1], in 2009 unintentional injuries accounted for more than 30% of the deaths of children aged 1-14 years, as shown in Fig. 1. This trend is a serious problem worldwide, and the number of unintentional injuries needs to be reduced. The number of unintentional injuries can be reduced by designing products that are based on an understanding of the interaction between the child and the shape of the objects. In the field of product safety, technology is strongly A. Marcus (Ed.): DUXU/HCII 2013, Part III, LNCS 8014, pp. 95–104, 2013. c  Springer-Verlag Berlin Heidelberg 2013