This video describes a hybrid effectiveness-implementation randomized controlled trial (RCT) of a digital health psychological intervention for pediatric chronic pain (WebMAP Mobile). The authors are Tonya Palermo, Rocio de la Vega, Caitlin Murray, Emily Law, and Chuan Zhou. This innovative trial used a stepped wedge cluster RCT design with 8 clinics in the U.S., recruiting 143 youth with chronic pain (ages 10 to 17 years). Effectiveness outcomes included pain intensity, disability, and global impression of change, while Reach, Adoption, Implementation, and Maintenance were implementation outcomes. Findings demonstrated successful implementation but effectiveness was limited by modest treatment engagement.