In 2008, the NIST established the Domain Expert Working Groups (DEWGs) in partnership with DOE’s GridWise Architecture Council (GWAC) to provide an open, regular means of collaboration among technical experts interested in furthering the goal of Smart Grid interoperability. Organized by Smart Grid domains, the six DEWGs are: transmission and distribution, building to grid, industry to grid, home to grid, business and policy, and a cross-cutting cyber security coordination task group. An additional working group on electric-vehicle-to-grid issues has recently been initiated.