In Chapter 4 of 20 in her 2009 Capture Your Flag interview, non-profit Peer Health Exchange (PHE) Executive Director Louise Davis highlights how knowledge, skills, and attitudes are three factors driving healthy behavior in teenagers. PHE pre- and post- tests these factors to measure success teaching teens healthy decision-making skills. PHE also uses student program evaluations to measure program effectiveness and gather feedback to improve how they empower students to make healthy decisions.