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While the System Usability Scale (SUS) is probably one of the most widely used questionnaires to measure the perceived ease of use of interactive systems, there is currently no scientific valid translation in French. This article describes the translation and statistical validation of the French version of the SUS, called F-SUS. On the basis of two translations carried out by a committee of bilingual experts, the various psychometric analyses made it possible to select only one translation. Fidelity measurement, factor analysis and sensitivity measurement obtained results very close or similar to the original version of the SUS. Thus, the F-SUS can be used with confidence by French-speaking usability researchers and practitioners.

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Many methods and tools have been proposed to assess the User Experience (UX) of interactive systems. However, while researchers have empirically studied the relevance and validity of several UX evaluation methods, few studies only have explored expert-based evaluation methods for the assessment of UX. If experts are able to assess something as complex and inherently subjective as UX, how they conduct such an evaluation and what criteria they rely on, thus remain open questions. In the present paper we report on 33 UX experts performing a UX evaluation on 4 interactive systems. We provided the experts with UX Cards, a tool based on a psychological-needs driven approach, developed to support UX Design and Evaluation. Results are encouraging and show that UX experts encountered no major issues to conduct a UX evaluation. However, significant differences exist between individual elements that experts have reported on and the overall assessment they made of the systems.

Impact de l'utilisabilité, la motivation et l'expérience utilisateur sur l'engagement à utiliser une application mobile Résumé Cette recherche s'intéresse aux manières d'engager des citoyens à utiliser durablement une application mobile. L'objectif est de déterminer la place de l'utilisabilité, de la motivation et de l'expérience utilisateur (UX) pour modifier et l'évaluer l'engagement. Mots clés choisis par les auteurs Engagement, expérience utilisateur, utilisabilité, application mobile, motivation Mot clés de la classification ACM H.5.m. Information interfaces and presentation (e.g., HCI): User Interfaces.

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