. 2020 Aug 19;15(8):e0237910. doi: 10.1371/journal.pone.0237910

Table 5. Improvements to identified problems during each iteration.

Iteration	Problems identified	Changes implemented
First	• Difficulty following and remembering instructions	• Increasing the size of the text
	• Difficulty following and remembering instructions	• Including single page instructions
	• Lengthy text	• Pictorial instructions
	• Complex language for low-proficiency English readers and low literacy users.	• Removal of jargon and technical terms used in the app
		• Adding videos to describe the image capture process
Second	• Unclear video instructions without audio assistance	• Colour scheme changes
		• Font changes
		• Adding audio to the video instructions
	• Difficulty capturing all images at good quality	• Adding audio to the video instructions
	• Difficulty capturing all images at good quality	• Scrolling icon to indicate a scrollable page
	• Difficulty differentiating colours of text and background	• Scrolling icon to indicate a scrollable page
	• Difficulty differentiating colours of text and background	• Decreasing the text on the instruction page
	• Misunderstanding of continuous, scrollable app pages and disjointed ones	• Decreasing the text on the instruction page
Third (Where findings from the previous iterations were implemented in the mobile app as a high-fidelity prototype)	• Difficulty capturing multiple images at different angles	• Adding additional guidance when capturing images at different angles
	• Uncertainty when submitting images	• Allowing submission of images with ease through clear presentation buttons and instructions