REL Southeast developed this facilitator’s guide on mathematical problem solving for use in Professional Learning Community (PLC) settings. The facilitator’s guide is a set of professional development materials designed to supplement the What Works Clearinghouse practice guide, Improving Mathematical Problem Solving in Grades 4 Through 8 (Woodward et al., 2012). The practice guide provides research-based recommendations for teachers to incorporate into their classroom practice. The facilitator’s guide is designed to complement and extend the practice guide by providing teachers in a PLC setting with additional, step-by-step guidance for the best ways to implement some of these evidence-based recommendations.