The advancement of digital technologies particularly in the domain of mobile health (mHealth) holds great promise in the promotion of health behavior. However, keeping users engaged remains a central challenge. This paper proposes a novel approach to address this issue by supplementing existing and future mHealth applications with an engagement wrapper - a collection of engagement strategies integrated into a single, coherent model. The engagement wrapper is operationalized within the format of an ambient display on the lock screen of mobile devices.
Keywords: Engagement; H.5.m. Information interfaces and presentation (e.g, HCI): Miscellaneous; Just-in-time adaptive interventions; mobile health (mHealth).