Validity Evidence for an Observational Fidelity Measure to Inform Scale-Up of Evidence-Based Interventions.

As evidence-based interventions are scaled, fidelity of implementation, and thus effectiveness, often wanes. Validated fidelity measures can improve researchers' ability to attribute outcomes to the intervention and help practitioners feel more confident in implementing the intervention as intended. We aim to provide a model for the validation of fidelity observation protocols to guide future research studying evidence-based interventions scaled-up under real-world conditions.