Carine Lallemand

How relevant is an expert evaluation of user experience based on a psychological needs-driven approach?

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.

Enhancing User eXperience during waiting time in HCI: contributions of cognitive psychology

Despite technological progress, daily Human-Computer Interactions (HCI) are still encompassing moments where the interaction between the user and the system is temporarily interrupted (file download, setup of a program, etc.). These waiting times are often sources of anxiety and irritation. In order to enhance the User eXperience (UX) during waiting time in HCI, this research based on cognitive models of time perception focuses on the impact of several variables on the satisfaction and waiting time perceived by a user. Variations in waiting time duration, cognitive workload and informational level of a feedback screen are therefore experimentally created to study their impact on satisfaction and waiting time perception. The results confirm the existence of a link between cognitive workload and waiting time perception and may provide valuable information for User Interface design.

Acceptability and Acceptance of Autonomous Mobility on Demand: The Impact of an Immersive Experience

Autonomous vehicles have the potential to fundamentally change existing transportation systems. Beyond legal concerns, these societal evolutions will critically depend on user acceptance. As an emerging mode of public transportation [7], Autonomous mobility on demand (AMoD) is of particular interest in this context. The aim of the present study is to identify the main components of acceptability (before first use) and acceptance (after first use) of AMoD, following a user experience (UX) framework. To address this goal, we conducted three workshops (N=14) involving open discussions and a ride in an experimental autonomous shuttle. Using a mixed-methods approach, we measured pre-immersion acceptability before immersing the participants in an on-demand transport scenario, and eventually measured post-immersion acceptance of AMoD. Results show that participants were reassured about safety concerns, however they perceived the AMoD experience as ineffective. Our findings highlight key factors to be taken into account when designing AMoD experiences.

La vitesse de défilement des barres de progression influence-t-elle la perception du temps d'attente?

This research focuses on the satisfaction and waiting times perceived by a user during the moments where the interaction between the user and the system is temporarily interrupted (file download, setup of a program, etc.). These waiting times are often sources of anxiety and irritation. They go usually with the presentation of an animated progress bar. The objective of this research is to study the impact of different variable-rate progress bars by varying the speed of scrolling. Thus, we are interested in the effects of acceleration and deceleration between progress bars positions. The results confirm the existence of a causal link between perception of waiting time and satisfaction. In addition, a progress bar with a decelerating speed is significantly more appreciated by the users. The results may provide valuable information for the design of computer interfaces.