Open Access

Maria Rauschenberger, Kristina Kölln, Jana Deutschländer, Andreas M. Klein, Dominique Winter

• Voice User Interfaces (VUIs) are becoming increasingly available while users raise, e.g., concerns about privacy issues. User Experience (UX) helps in the design and evaluation of VUIs with focus on the user. Knowledge of the relevant UX aspects for VUIs is needed to understand the user’s point of view when developing such systems. Known UX aspects are derived, e.g., from graphical user interfaces or expert-driven research. The user’s opinion on UX aspects for VUIs, however, has thus far been missing. Hence, we conducted a qualitative and quantitative user study to determine which aspects users take into account when evaluating VUIs. We generated a list of 32 UX aspects that intensive users consider for VUIs. These overlap with, but are not limited to, aspects from established literature. For example, while Efficiency and Effectivity are already well known, Simplicity and Politeness are inherent to known VUI UX aspects but are not necessarily focused. Furthermore, Independency and Context-sensitivity are some new UX aspects for VUIs.