Although co-teaching has been a topic of interest for more than two decades among professionals advocating inclusive practices (e.g., Bauwens, Hourcade, & Friend, 1989; Garvar & Papania, 1982), the No Child Left Behind Act of 2001 (NCLB) and the Individuals with Disabilities Education Act (IDEA) mandates for curriculum access, high expectations for achievement and accountability for outcomes for students with disabilities have broadened its appeal. The purpose of this document is to describe how state education agencies (SEAs) are supporting co-teaching in schools, including through policies and guidance and co-teaching initiatives. This document represents a collaboration between Project Forum at the National Association of State Directors of Special Education (NASDSE) and the University of North Carolina at Greensboro (UNCG) and was prepared as part of Project Forum at NASDSE's cooperative agreement with the U.S. Department of Education's Office of Special Education Programs (OSEP). (Contains 1 footnote and 4 online resources.)