Table 8.

Identified usability problems and mitigation measures.

App’s features and identified usability problems			Mitigation measures
Editable list of children
	The edit button on the child’s profile was not obvious enough	The whole patient’s profile card should be made clickable.
Child’s profile page
	Uncertainty as to whether the entries for chronic illnesses and regular medications are saved in the app	Entries for chronic conditions and regular medications should be visible on the patient’s profile page.
Browsing through the pages or menus
	Difficulty in locating the EDa departure announcement button	The I am coming to the ED button should also be placed on the home page.
	Difficulty in locating the diagnostic sheet	The history page should be changed to diagnostic history.
	Difficulty in locating the map tutorial	The map tutorial should be placed directly in the map page. The tutorial could start automatically when the map is used for the first time, as is the case in many apps.
	Difficulty in locating the waiting times page, the forecast page, and the symptom page	The tree-testing and card-sorting techniques should be used to improve the information architecture and the nomenclature. A search bar should also be added.
Symptoms’ decision tree
	Difficulty in browsing through the symptom’s decision tree	A search bar and more redundancy should be added.
Real-time display of the ED waiting room
	The meaning of “occupancy” in the waiting room was not clear for nonacquainted users	The busy screen should be redesigned using a more explicit graphic representation and adding a caption. Representing patients by avatars and not by cars could be more intuitive for the user.
Geolocation and guidance to the ED
	Geolocation markers were not explicit enough on the map page	Knowing that icons are images and that images can be polysemic, their understanding can vary from one person to another. To reduce this effect, a locator pin with a textual indication could be used. In addition, it could be enlarged and bounced to attract the user’s attention.
ED departure feature I am coming to the ED
	No prompt to indicate to the user that they must select the child to be announced on departure to the ED	A selection checkbox should be set up so that users understand that they need to select a child.
	It should be easily possible to hide the pop-up message confirming the patient’s departure to the ED	The chevron must be enlarged to make it more visible.

^aED: emergency department.