The articles in this special Practitioner's Edition of "Psychology in the Schools" share the application of sound educational and behavioral practices in real school and classroom contexts. Given this emphasis in these articles on the applied use of behavioral practices, the purpose of this brief commentary is to highlight and comment on some of the "big ideas" that link these practitioner-focused articles. Specifically, three main questions are addressed: (a) Where did the "triangle" come from? (b) Why are schools increasing their use of local data to guide decision making? (c) What is school-wide positive behavior support? (Contains 1 figure.)