Table 1.

Themes and design implications from the qualitative interviews.

Key themes and subthemes		Quotes	Design implications
1. Characteristics of the adjunctive strategy
	Unique or interesting features	I love learning things … a quiz would be a lot of fun and little fun facts would, stick out more against all the notifications on the phone. [Participant #1]	Type of content provided, and the way it is presented, needs to capture the interest of users.
	Useful and applicable content	If it's stuff where it's like, oh, I can actually use that information, or do something with that. [Participant #5]	Content needs to be well-aligned with users’ needs.
2. Timing of notifications
	Regular, but not too frequent	I guess personally, I find when I have a reminder on my phone that goes off every day, I quickly start to ignore it. So maybe if it's too consistent, it sort of gets overlooked. [Participant #15]	Weekly notifications may be most appropriate.
	Type of day	…maybe weekends, where I don't have other things on. [Participant #3]	Users may be more available to attend to notifications pushed out on weekends than weekdays.
	Time of day	I guess probably two times, either in the morning before 9AM, like before I wake up… Or the other time would probably be maybe towards the end of the day. So, maybe like 7-8PM. [Participant #8]	Mornings and early evenings may be the most suitable times of the day for pushing notifications.
3. Suitability of social media
	Familiarity	I love a good social media page. I think most people our age probably do. [Participant #5]	Using Instagram as a platform will reduce the inertia toward users having to learn a new platform.
	Sense of community	I like when there's sort of a community aspect to it. Liking this page and doing that, it just sort of makes you more involved in the whole process. And it also reminds you if you're just scrolling through Facebook and then you see a post, then it will remind you, oh, maybe I'll use the app now or later because sometimes it's easy to forget. [Participant #3]	Users may feel more motivated to attend to the strategy and app if they are aware that they are not alone in the challenges they face.