The purpose of this research study is to evaluate the effectiveness of short refresher sessions. "Pain Practice Change Boosters" given at regular intervals to sustain improved pain process (assessment and management) and clinical outcomes (pain intensity) achieved during a 15 month knowledge translation intervention, Evidence-based Practice for Improving Quality (EPIQ), in 8 children's hospitals in Canada; and to determine the factors that affect that sustainability. The CIHR Team in Children's Pain (2006-2011) evaluated the effectiveness of the EPIQ intervention in 32 hospital units (4 units at each hospital site). 16 hospital units were allocated to the intervention group and 16 units continued with standard care. The current study focuses on the 16 hospital units that implemented the EPIQ intervention only.