Table 4.

Identified problems of the usability test, and short- or long-term solutions.

Problem		Short-term solution (by the project)	Long-term optimization (by the developers)
Usability problems
	Language	User training; provide a document with translations and explanations; check and adjust existing REDCap language file	Simplified language selection; complete translation, including system messages and synchronization report
	Feedback	User training; provide a test system	User expertise-based help
	Perceived offer character	User training; provide a test system	Optimization of user interface
	Inconsistent interaction design	User training; provide a test system	Enable input by typing or hide input field; provide keyboard type based on the field type (eg, numeric keyboard)
	Navigation	User training; create a short paper-based how-to guide	Simplification of navigation (eg, log out)
	Knowledge error	User training; provide filling out instructions directly in the questionnaire	User expertise-based help
Functionality problems
	Data synchronization	User training; include a note at the end of the questionnaire to regularly synchronize the records	Sending notifications on the device in case of nonsynchronized records
	Follow-up interview	User training; create a short paper-based how-to guide for follow-up interviews	Optimized visit overview