Table 1.

Usability issues

Problem	Source of the problem	Problem frequency	Nielsen scale score	Observations
Zoom increase/decrease functionality deemed insufficiently accurate by participants	User Interface (UI)	6/6 (100%)	3/4	The Timeline overview does not allow accurate zooming to select the detailed view range
Absence of prescription data	Data source	6/6 (100%)	3/4	Prescriptions were not digitized in the Intensive Care Unit
Text highlighting did not work during the search	UI	1/6 (17%)	3/4	Issues with accent detection
Medication regimens were not displayed	UI	6/6 (100%)	3/4	Data on medication regimens were not available
Hierarchical tree of biological concepts: navigation problems	Complexity of the terminology in the UI	3/6 (50%)	2/4	The hierarchical tree of laboratory results was too large to allow users to easily find information without filtering
Repositioning document windows	UI bug	2/6 (34%)	2/4	The window slid under the menu bar