Table 2.

Interview guide using social cognitive theory as the guiding framework

#	Question Type	Question & Aims
1	Personal/ Individual Factors	• Describe how you felt when using the [app name] mHealth app (i.e.: comfort, support, frustration, empowered, etc.).? • What assisted you or was a barrier in using the app for the first time; from continuing to you the app? • What would make the app more appealing or usable for you? (colors, fonts, representation) • What do you think has to be addressed to make something like this easier for you to use? Such as training on how to use the app?
2	Behavioral Factors	• Were you motivated to use the app? What motivated you to use the mHealth app such as a desire to be in control of your health, your role as a caregiver, mother, hope for the future etc.? • If you were not motivated to use the app, can you describe the reasons such as: inconvenience, not interested, do not like technology etc.?
3	Environmental Factors	• Describe what it was like using the [name of app] within your environment such as at home, at work, in the community (park, vehicle, on the street, in waiting rooms, appointments, etc.). • What assisted or became a barrier to using the app in these places? • What do you think has to be addressed to make something like this easier for you to use? Such as assistance with cell phone plans, restrictions on data sharing/mandatory reporting; training for agencies who use this? • What concerns do you have with people or systems (PO, probation, counselors, HCPs) having access to the app, your data, and knowing you use this app? • Are there features or data you should have access to while having other pieces of the data be restricted?
4	Personal/ Individual Factors Behavioral Factors	• Tell me how using the [name of app] improved how you felt about managing your health and safety? • Was there anything within the app that decreased your feelings of being capable of managing your health and safety? • Which health and safety features did you find most/least useful? • How did your health/safety improve or decline while using the app?
5	Personal/Individual Factors	• Can you describe what ways your knowledge about your sexual health and safety increased while using [name of app]? • What personal or environmental factors helped with increasing your knowledge such as previous experience using mHealth apps; prior experience managing these health issues; training opportunities; systems allowing you to use the app etc.?
6	Personal/Individual Factors	• How did the use of [name of app] help manage your daily/ emergency/ acute sexual health behaviors? Such as behaviors in safe sex practices; increasing agency and autonomy during sexual encounters; tracking symptoms of STI/STD; tracking; reporting; or identifying instances of imminent or experienced sexual violence? • What outcomes would you like more assistance with and that are most important to you?
7	Personal/Individual Factors	• How did the use of [name of app] assist in accessing resources or support specific to your sexual health and safety? • What concerned you about your confidentiality with the legal, court, CPS, or MAT system, with your partner or family? • How was your health improved or restricted when accessing these resources and support system?