A cross-sectional study assessing modifications to the delivery of a multi-component implementation strategy (the Get Outside, Get Active program) to improve child physical activity in early childhood education and care services.

GOGA was delivered with high fidelity to protocol as indicated by the level of BCT delivery. This article details a thorough approach to documenting modifications and provides guidance for future studies. SO WHAT?: This article contributes to the emerging evidence regarding documentation of adaptations and modifications to public health implementation interventions.