This report provides technical documentation for the quantification of scenarios developed by the Tellus Institute for the Boston Scenarios Project (“BSP”). It serves as a supplement to the BSP final report: Alternative Long-Range Scenarios for the Boston Region: Contours of the Future. The report analyzes three long-range scenarios for the Boston region (Business-As-Usual (BAU), Policy Reform, and Deep Change), presenting the quantitative inputs and assumptions used in developing the scenarios and projecting them out to the year 2050.