The Southern California Association of Governments is the largest Metropolitan Planning Organization in the U.S., comprised of 191 cities and six counties. In this presentation, SCAG introduces its new Regional Data Platform as a revolutionary new system for planning across scales and jurisdictions to help address border-transcending challenges facing the region. SCAG highlights the symbiotic relationship between local and regional planning, and the role of better data, tools, and government-to-government collaboration in addressing shared challenges under a common vision.