A state department of education (SDE) served by the Southeast Comprehensive Center (SECC) at SEDL requested information regarding state use of schoolwide, large-scale professional learning communities (PLCs). Specifically, the SDE staff wanted to know the following with respect to PLC work in other states: (1) Are PLCs state-mandated through legislation, policy, or regulation? (2) What types of PLCs have been established, and are they part of other state-based initiatives? (3) Are PLCs established statewide, as stand-alones, or at the school or district levels? and (4) What support does the state provide for its PLCs, such as training and resources? This Information Request provides a discussion of the procedure for selecting materials to include in this request, limitations of the materials, and information regarding statewide use of PLCs. This information includes reference resources from Learning Forward, Learning Point Associates, and the State Educational Technology Directors Association; several specific examples of states that have implemented PLCs; and resource summaries that delineate recommendations and findings regarding the quality and effectiveness of PLCs.