This document summarizes key factors at the school, teacher, and student levels that affect student achievement based on Robert Marzano's book review of "What Works In Schools". At the school level, these include having a guaranteed and viable curriculum, setting challenging goals and providing effective feedback, and fostering parent/community involvement and a safe learning environment. At the teacher level, the important factors are instructional strategies, classroom management, and curriculum design. Finally, the student level factors that influence achievement are the home atmosphere, learned intelligence/background knowledge, and motivation. The document also outlines Marzano's framework for implementing changes to improve student outcomes through data-driven phases of examination, intervention, evaluation, and repetition.