Table 4.

Major usability issues related to the personalization features and modifications made to overcome them.

Usability issues				Changes implemented
Offering information in layers
	Iteration 1
		Not being aware that additional information could be retrieved in the second layer of the interface	Add an outlined button including an icon at the bottom of the interface to access this information Add icons to the text buttons “Concise” and “Extensive” at the top
	Iteration 2
		Not being aware that additional information could be retrieved in the second layer of the interface	Move the topmost buttons “Concise” and “Extensive” to the left of the interface, change to outlined buttons, and change the text label to “Concise information” and “Extensive information”
	Iteration 3
		Not being aware that additional information could be retrieved in the second layer of the interface	N/Aa
Adding questions and indicating unclear information
	Iteration 1
		Not linking the button label “I have a question” to the phrasing “...indicate that you do not understand particular information” mentioned in the task Not indicating the paragraphs containing unclear information	Change the button label to “I do not understand something or have a question” Add the following instruction: “You can select multiple paragraphs. Please click the button ‘Continue’ to continue with the other information sections. By clicking the button ‘Cancel,’ your designations on this page will be removed”
	Iteration 2
		Not indicating the paragraphs containing unclear information Not knowing how to add a general questionb	Add clarification in the task Add instructions to the user interface regarding the fact that a general question can be added by pressing the button on the top right of the interface
	Iteration 3
		Not indicating the paragraphs containing unclear information			N/A
Providing informed consent
	Iteration 1
		Not indicating that all questions were answered	Put the button “Marked as solved” next to the question
	Iteration 2
		Not correctly using the button “Marked as solved”	Change the button to a slider
	Iteration 3
		Not correctly using the slider	N/A

^aN/A: not applicable.

^bThis task was conducted during the second and third iterations only.