Table 3.

bWell content and behaviour change techniques

Feature content	Description	Behaviour change techniquea
Information provision	Information about ULD, the recovery stages and all individual exercises based on evidence-based guidelines	Education/information
Video demonstrations	Detailed video instructions of each exercise and each recovery stage	Demonstration of behaviour
Graded tasks	Progressively more difficult exercises to increase arm/shoulder ROM and strength	Education/information
Record exercises performed	Calendar feature to record if each session of exercises was performed	Monitor and record behaviour
Motivational statements	Verbal instructions (including messages for reassurance) for each exercise	Motivation
Push notifications, including opt-in opt-out option	Self-setting reminder function to prompt patient daily to access next exercise session to increase engagement and user retention	Motivation
Behaviour and progress tracking	Self-rate pain, flexibility and mood each day that the app is used with visual display in calendar to see change over time	Self-monitoring of outcome/feedback on outcome of behaviour
Diary function	Diary function in calendar to allow reflection on daily function	Self-monitoring of behaviour
Section FAQs	Questions about the purpose of bWell, e.g. technical issues, emails, non-technical user questions	Education/information
Web links	Web links to contact information about breast cancer related resources or support	Education/information

ULD upper limb dysfunction

^aBCTs as described and classified by Michie et al. [77]