Table 3.

List and scores of interface elements that resulted from the focus group study.

Theme	Subthemes	Interface elements (score)a	Related systems
Behavior change strategies	Education	Instruction (4.0)	Rest on Time
Behavior change strategies	Goal setting	Goal selection (5.7)	Protect Your Vision
Behavior change strategies	Monitoring	Participation (4.8)	Rest on Time
Behavior change strategies	Feedback	Descriptive message (4.0) Comparative message (+) (4.2) Evaluative message (+) (4.2) Compliment message (4.8)	Rest on Time Protect Your Vision
Behavior change strategies	Reward	Monetary reward (+) (5.0) Score reward (+) (4.2)	N/Ab
Elements	Information delivery	Health information (+) (6.0)	N/A
Elements	Notification	Popup (4.8) Full screen (4.3)	Rest on Time
Characteristics	Medium	Physical signal (−) (2.2) Sound (4.0) Screen based (6.2)	Protect Your Vision Eye Protector Rest on Time
Characteristics	Complexity	Rotated message (+) (6.0)	N/A
Characteristics	Aesthetics	An agent with robot appearance (4.0) An agent with expert appearance (+) (5.2) Spot effect (−) (2.8) Flashing effect (−) (2.8) Blurred effect (4.8) Symptom-like effect (+) (5.7)	Protect Your Vision Eye Protector
Workflow	User defined	Customization (+) (6)	N/A
Workflow	Conditions	20-20-20 (4.8) 60-5 (4.0) Just-in-time (+) (4.2)	Protect Your Vision Eye Protector Rest on Time

^aInterface elements with low effectiveness are marked with “−,” and interface elements newly added during the focus group discussion are marked with “+.”

^bN/A: not applicable.