Hollender, NinaLi, YiqiHeld, TheoBoll, SusanneMaaß, SusanneMalaka, Rainer2017-11-222017-11-222013978-3-486-77856-4https://dl.gi.de/handle/20.500.12116/7522Having to switch between task descriptions and the interface during a usability test induces cognitive load for participants and increases time on task. An explorative study is reported, showing a large individual variability in how often and for how long participants returned to task descriptions. They returned to descriptions at least once in 80% of all cases (Max=13, Median=2), spending up to 147s re-reading the description (Median=7s). This constituted up to 67% of the total time on task. Practical implications regarding the design of task descriptions and for summative usability testing are sketched.enUsability Testingtask descriptionstime on tasksplit-attentionmuc: kurzbeitrag (poster)