Table 2 Example questions from the semi-structured interview guide

Describe how you employ FBT in your program and specifically with adolescents and their families.

To discover how clinicians use FBT within their programs.

How do you introduce and use FBT with families across the span of adolescent development?

Gain understanding of how clinicians explain and introduce the interventions and principles of of FBT.

How is [insert intervention of FBT] used across adolescent development with families?

Discern how clinicians and treatment teams are using FBT similarly and differently with adolescents and TAY.

Probes: How and why did you adapt that intervention? How do adolescents/TAY and families respond to this adaptation?

To explore further the responses given by clinicians/ treatment teams/adolescents/TAY and families to adaptations to FBT in each phase.