This is the third brief in a series: Building a Post-Care Service System in Child Welfare: Lessons Learned from the Frontlines of Implementation Science in Catawba County. The first of the three briefs provided background information on the initiative that is the focus of the series — the Catawba County (NC) Child Wellbeing Project. Both Brief 2 and this third brief examine the Project’s use of implementation science – scientific methods that promote the uptake of research into routine practice settings – to help bring about systems change.