This document represents a proposed outline for conducting a Before and After Study of the DART Green Line, a major extension of DART's light rail transit (LRT) system. Such studies track the costs and impacts of the extension of Red Line service into the North Central Corridor and analyze the accuracy of forecasts made during project planning. As the Green Line initially began as two separate planning corridors, the Northwest Corridor and the Southeast Corridor, this planned study replaced original planned studies of the two corridors.