Table 2.

Usability issues identified by patients’ think-aloud protocols.

Aspect	Usability issue
Overall	German version would be easier to handle App crashes sometimes Information pages are too text-heavy Filter list function should support automatic filtering Asana list under video was mistaken for an automatic playlist because of design A smartphone is impractical for exercising, and a tablet would be more appropriate, especially for the videos
Progress tracker	Top tab navigation (My Progress—Tests-FAQa) was overlooked Difficulties finding the tab Tests because the default landing page of the Progress Tracker is My Progress and both the tabs look identical (compare Figure 2A and Figure 2B)

^aMy Progress-Test-FAQ is the tab where patients can see the disease progress as it was requested in T4. The Metrology Index (BASMI) is visualized over time in the form of a graph.