Each recommendation includes implementation steps and solutions for common roadblocks. The recommendations also summarize and rate supporting evidence. Supporting evidence is drawn form a range of literature, from rigorous experimental studies to expert reviews of practices and strategies in mathematics education. Evidence ratings reflect the degree to which each recommendation is supported by high-quality experimental and quasi-experimental design studies that meet WWC standards. This guide is for teachers, math coaches, other educators, and curriculum developers who want to improve the mathematical problem solving of students.