Construction of UEQ+ scales for voice quality: measuring user experience quality of voice interaction

The UEQ+ is a modular framework for the construction of UX questionnaires. The researcher can pick those scales that fit his or her research question from a list of 16 available UX scales. Currently, no UEQ+ scales are available to allow measuring the quality of voice interactions. Given that this type of interaction is increasingly essential for the usage of digital products, this is a severe limitation of the possible products and usage scenarios that can be evaluated using the UEQ+. We describe in this paper the construction of three specific scales to measure the UX of voice interactions. Besides, we discuss how these new scales can be combined with existing UEQ+ scales in evaluation projects

Agile Values and Their Implementation in Practice

Today agile approaches are often used for the development of digital products. Since their development in the 90s, Agile Methodologies, such as Scrum and Extreme Programming, have evolved. Team collaboration is strongly influenced by the values and principles of the Agile Manifesto. The values and principles described in the Agile Manifesto support the optimization of the development process. In this article, the current operation is analyzed in Agile Product Development Processes. Both, the cooperation in the project team and the understanding of the roles and tasks will be analyzed. The results are set in relation to the best practices of Agile Methodologies. A quantitative questionnaire related to best practices in Agile Product Development was developed. The study was carried out with 175 interdisciplinary participants from the IT industry. For the evaluation of the results, 93 participants were included who have expertise in the subject area Agile Methodologies. On one hand, it is shown that the collaborative development of product-related ideas brings benefits. On the other hand, it is investigated which effect a good understanding of the product has on decisions made during the implementation. Furthermore, the skillset of product managers, the use of pair programming, and the advantages of cross-functional teams are analyzed

Usability Evaluation Methods for Special Interest Internet Information Services

The internet provides a wide range of scientific information for different areas of research, used by the related scientific communities. Often the design or architecture of these web pages does not correspond to the mental model of their users. As a result the wanted information is difficult to find. Methods established by Usability Engineering and User Experience can help to increase the appeal of scientific internet information services by analyzing the users� requirements. This paper describes a procedure to analyze and optimize scientific internet information services that can be accomplished with relatively low effort. It consists of a combination of methods that already have been successfully applied to practice: Personas, usability inspections, Online Questionnaire, Kano model and Web Analytics

I sense that there is someone else

Based on the results of two laboratory studies, we show how the implementation of minimalistic social and task-relevant cues in Augmented Reality-based assistance systems for spatially dispersed teams impact team experience while not affecting team performance. In study 1 ($\it N$ = 224) we investigated the Ambient Awareness Tool, which supports spatially dispersed teams in their temporal coordination when multiple team tasks or team and individual tasks must be executed in parallel. We found that adding a progress bar to the interface led to a significant increase in the perception of work group cohesiveness (diff = 0.34, $\it p$ = .03, CI: [−0.65; −0.03], $\it d$ = 0.39), but did not affect team performance ($\it p$ = .92, $\eta^{2}$ = 0.03). In study 2 ($\it N$ = 23) we piloted an AR-based avatar representation of a spatially dispersed team member and evaluated whether the interactivity of the avatar impacts the perception of co- and social presence as well as team performance. An interactive avatar increased the perception of co- and social presence (co-presence: diff = 2.7, $\it p$ < .001, $\eta^{2}$ = 0.20; social presence: diff = 1.2, $\it p$ = .001, $\eta^{2}$ = 0.06). Team performance did not differ significantly ($\it p$ = .177, $\eta^{2}$ = 0.01). These results indicate that even minor social and task-relevant cues in the interface can significantly impact team experience and provide valuable insights for designing human-centered health-promoting AR-based assistance systems for spatially dispersed teams in the vocational context with minimal means

Multistep cascade model for the deexcitation of highly charged ions impinging on a solid surface

We introduce a multistep cascade model for the deexcitation of highly charged ions in the presence of a solid. We apply this model to analyze the yield of the KLL Auger peak as measured in angular resolved electron energy spectra. The calculation makes use of three probability densities, one for the time distribution of the Auger decay, one for the transport of the ions through the first atomic layers of the target, and the last one for the transport of the electrons from the source to the detector. Each of these probabilities is discussed and modeled. The calculations are compared to measurements of KLL Auger electrons from low energy Ne9 ions impinging on solid Al. The results support previous estimations that the L shell sidefeeding of the projectile depends on the incident velocity. For ion energies greater than 1000 eV, the mean path length needed to capture an electron is found to be approximately equal to the next neighbor distance in the Al lattice. We estimate the yield of KLL electrons emitted from Ne ions with 2,3,...,8 electrons in the L shell. The mean depth of emission of the KLL electron is determine

Multiple cascade model for the filling of hollow Ne atoms moving below an Al surface

Analytic expressions for a multiple cascade model were derived to study the filling of L and K vacancies of hollow Ne atoms moving in shallow layers of an Al surface. The model requires cross sections for charge transfer into the L shell of the projectile that were determined from molecular orbital calculations including screening effects of hollow atoms and asymptotic solid state energies. The analysis accounts for mechanisms of Landau Zener curve crossing and Fano Lichten promotion. To describe the transport of the electrons within the solid, absorption and buildup effects were taken into account. The results from the cascade model show good agreement with angular distributions of Ne K Auger electrons recently measured. Attenuation effects were found to produce shifts in the K Auger spectra at varying observation angles. The significant difference previously observed for the mean L shell occupation numbers during L and K Auger emission is explained by the present mode