The adaptation and fidelity tool to support social service practitioners in balancing fidelity and adaptations: Longitudinal, mixed-method evaluation study.

Practical tools are needed to guide professionals not only to adhere to intervention core elements but also to help them to manage fidelity and adaptation. The proposed A-FiT intervention for practitioners' management of both fidelity and adaptation is a novel contribution to the implementation literature. Potentially, the next step is an evaluation of the intervention's impact in an experimental design.