The state of the art summarizes available knowledge, meant to assist the forensic practitioner in cases presenting extraordinary writing conditions. It provides a detailed and critical review of dynamic feature variations and circumstantial parameters affecting dynamic signatures. ![]() This article focuses on dynamic signatures and their features. Taking into account the variability of users’ motor skills during the design and evaluation of interactive systems is necessary to better understand their difficulties as well as to improve the ergonomics and the usability levels of tactile interaction. The analysis of the postures of the users’ wrists during interaction allowed to elucidate the relationship between the characteristics of the movements of older adults and their performances, particularly concerning the longer times needed for executing the gestures of interaction as well as the increased error rates of this group of users when compared to younger adults. In this framework, a special attention was given to the analysis of the movements of the user. ![]() To this study, we designed an interactive system consisted of tactile puzzle games and using drag-and-drop interaction for positioning the puzzle pieces into their corresponding targets. ![]() This thesis aims to study the interaction of older adults with touchscreens in order to identify usability issues on different devices and input modalities (smartphone and tablet, finger and stylus). However, the aging effects on the motor skills implied on tactile interaction haven’t been enough considered during the design and evaluation of tactile interactive systems, what prevent this group of older adult users to be digitally included successfully. Tablets and smartphones have become mainstream technologies.
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