The case against user interface consistency
Communications of the ACM
Evaluating a user interface with ergonomic criteria
International Journal of Human-Computer Interaction
Graceful degradation of user interfaces as a design method for multiplatform systems
Proceedings of the 9th international conference on Intelligent user interfaces
ARTIMIS: natural dialogue meets rational agency
IJCAI'97 Proceedings of the Fifteenth international joint conference on Artifical intelligence - Volume 2
Asymétrie du transfert modal lors d'un dialogue personne-machine
IHM 2005 Proceedings of the 17th international conference on Francophone sur l'Interaction Homme-Machine
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This report presents the results of an empirical analysis of a multi-device service which is accessible both from a Web interface on a PC and a spoken interface over a telephone. The objective of this study was to deepen our understanding of inter-usability issues related to multi-device services. Inter-usability is defined as the easiness with which users transfer and adapt the knowledge they have acquired from previous uses of their service while they access it with a new device. The results of this study, obtained from a sample of 20 users achieving a series of use scenarios, highlights the need to keep data, functions and use procedures as consistent as possible between the various devices but reveals, at the same time, inter-device inconsistencies that are not detrimental to the dialogue quality and even, in some cases, desirable. These results stress the relevance of user's activity analysis in designing multi-device services and suggest some basic principles that may drive their design.