1. The Youth Offending Services Effectiveness Checklist (YOSEC) evaluates how well youth offending programs incorporate evidence-based practices shown to reduce reoffending. 2. YOSEC was developed through extensive research and consultation to help funders and providers assess program strengths and areas for improvement. 3. Studies show programs that implement YOSEC's evidence-based recommendations can reduce reoffending by up to 32%, while programs that implement none may increase reoffending by 7%.