This is an 8 hospital repeated measures Randomized Controlled Trial design using a centrally controlled cluster random allocation of units with stratification by hospital. The sample consisted of the 16 hospital units that implemented the EPIQ intervention in the CIHR Team in Children's Pain study. Randomization was restricted so there was one intervention unit and one standard care unit at each site. Outcomes were measured at 3 time points:12 months after the completion of the EPIQ intervention: Baseline (Time 1); 12 months following the implementation of the Booster intervention (Time 2); and 36 months following the implementation of the Booster intervention (Time 3), including the frequency and proportion of children receiving pain assessment and management strategies, children's pain intensity during painful procedures, and health care professionals' perceptions of the context of sustainability.