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In this paper we report the results of two multi-cultural user requirement surveys which have been conducted within the European AAL-JP-project fearless prior to technical specification of an ambient event detector for solitarily living elderly. Needs and expectations of older adults (N=259), relatives and trusted persons (N=215) as well as healthcare professionals (N=22) from Austria, Germany, Spain (Catalonia), and Italy were surveyed. Subsequently, a set of system requirements was derived from the empirical data. These requirements were integrated into a Technological Impact Assessment Model (TIAMo) which describes the interplay of technical performance, psychological well-being and business indicators related to the projected ambient event detector. In the forthcoming stages of the user-centered design process the TIAMo will serve as a “balanced scorecard” for project evaluation.
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