Table 2.

Main issues, with sample quotes, identified from the first round of usability testing with solutions implemented in the second iteration of the app.

Domain and issue		Sample quotes	Solution
Perceived ease of use
	Instructions for beginning each balance task	“The instructions should be in the beginning and say the first 5 beeps do the purpose to adjust the device. Then the sixth beep is when you start the test and you do it until a final beep after 30 seconds.”	Within the second iteration of the app, instructions were added prior to each balance task explaining when each task begins and ends.
	Inaccurate fall risk score	“What do I do next?” “Do I go to Full Test?”	Only the questionnaire button is displayed until the questionnaire is complete. The Full Test button appears after the questionnaire is complete.
	Dragging a slide bar	“How do I change the number?” “My fingers can’t move the bar.”	The slide bar was replaced with a key-in entry.
	Swiping between screens	“You should indicate if I need to swipe left to right or up to down.”	Forward and back arrows were added to each screen.
Perceived usefulness
	Fall prevention strategies	“It was very beneficial to get your prediction for falling. I would, at the very end, provide a link to demonstrate preventative measures to reduce the risk of falling.”	N/Aa

^aN/A: not applicable.