Table 1.

Codebook adapted from the Acceptability of Healthcare Interventions framework [19]

Construct	Description
Affective Attitude	How the participant feels about taking part in My Journey 3
Burden	The perceived amount of effort that is required to participate in My Journey 3
Ethicality	The extent to which My Journey 3 has a good fit with the participant’s value system
Intervention Coherence	The extent to which the participant understands My Journey 3 and how it works
Opportunity Costs	The extent to which benefits, profits or values must be given up to engage with My Journey 3
Perceived Effectiveness	The extent to which My Journey 3 is perceived as likely to achieve its purpose
Self-efficacy	Participants’ confidence that they can perform the behaviours required to use and engage with My Journey 3