Table 2 Process evaluation components, areas of research, explanatory data and outcomes

Implementation (what is implemented and how?)

➢ Fidelity of implementation

➢ Dose of intervention delivered

➢ Adaptations

➢ Reach

➢ Therapist contact/time (n = 110)

➢ BIP TIC adherence (n = 110)

➢ Usage metrics (n = 110)

➢ Clinician (n > 5), children and parent (n= > 20), therapist (n= > 5) interviews

➢ Engagement and satisfaction with intervention

Mechanisms of impact (how does it produce change?)

➢ Mediators and moderators

➢ Unexpected pathways and consequences

➢ Usage metrics

➢ Therapist contacts

➢ Clinician, children and parent, therapist interviews

➢ YGTSS TTTS change

Context (how do factors external to the intervention affect implementation and change?)

➢ Factors related to improvement in YGTSS TTSS, fidelity of delivery

➢ Demographic data

➢ Clinician, children and parent, therapist interviews

➢ Service use

➢ Comorbidities

➢ Baseline severity of tics

➢ YGTSS TTTS change

➢ Engagement with intervention