Table 2 Intervention fidelity plan: The GLOW trial
BCC fidelity domain | Fidelity strategies implemented in GLOW |
|---|---|
Intervention design | ▪ Standardize intervention dose (e.g., number and duration of sessions) ▪ Standardize interventionist credentials (registered dietician) ▪ Specify theoretical model (Behavior change techniques based on social cognitive theory and motivational interviewing) |
Interventionist training | ▪ Standardize training (e.g., training includes formal skill-building curriculum in motivational interviewing) ▪ Assess and monitor skill maintenance over time via weekly supervision, periodic re-certification and    retraining, and provision of feedback |
Intervention delivery | ▪ Use an intervention protocol ▪ Document intervention delivery (e.g., number, duration, and content of sessions delivered) using an electronic tracking system and written checklists; review regularly ▪ Audiotape all sessions; code 10% of selected core sessions for key behavior change techniques, using a checklist adapted from the Behavior Change Technique Taxonomy v1 [25] ▪ Conduct periodic live observations |
Intervention receipt and enactment by participants | ▪ Summarize intervention content and skills at each session ▪ Document participants’ performance of intervention skills (e.g., frequency of self-monitoring) using an electronic tracking system; review regularly and provide feedback, both to participants and interventionists |