Table 5.

NUDGES framework of kencom.^a,b

Framework components	Explanation	Corresponding features of kencom (examples)
iNcentives	Incentives encourage the action	kencom points for daily logging-in and entry/winning of Arukatsu events; users can get gift vouchers from kencom points that can be spent in the market place
Understanding mappings	Understandings of the relations between choice and welfare prevent dropouts	Easy and detailed description of Arukatsu events to prevent dropouts; tailored articles and visualization of physical activity may appeal to the users’ emotion that healthy behaviors may lead to mental, physical, and financial benefit
Defaults	Better default settings improve the usability	Positive, big images like savory dishes or beautiful landscapes are displayed in the initial screen after logging-in (priming effect); no need to input step or health data by users
Giving feedbacks	Positive feedback keep one’s motivation	Setting of the daily goals of physical activity (declaration of commitment) and positive feedback according to the self-checked achievements; comment function in Arukatsu to encourage the team members with each other
Expecting errors	Prevention of expecting errors enhances one’s commitment	One-click entry for Arukatsu to avoid procrastination; synchronization with smartphone accelerometers to keep daily record and minimize measurement errors
Structure complex choices	Avoidance of complex options and optimization of the structures lead to less stressful experiences	The simple design allows anyone including those not familiar with a smartphone to use the app immediately; optimized user experience according to the frequency of user’s decision

^aThe features of kencom that satisfy NUDGES framework are summarized [18].

^bThe adherence to the NUDGES framework may lead to a better chance of altering one’s behaviors.