This brief, authored by Rachel Holzwart, Hilary Wagner, and Megan Worden, summarizes key themes from the 2020 Office of Planning, Research, and Evaluation Methods Meeting on using core components approaches in social services settings. Core components of effective interventions are the “essential functions and principles that define the program and are judged as being necessary to produce outcomes in a typical service setting” (Blase & Fixsen). Core components approaches can complement traditional social policy evidence building, provide information needed to successfully adapt programs across a variety of conditions, and determine which intervention elements are critical to achieving desired results and delivering benefit to participants.