The State of the Future Index (SOFI) is a measure of the 10-year outlook for the future based on historical data for the last 20 years. It is constructed with key variables and forecasts that, in the aggregate, depict whether the future promises to be better or worse. The SOFI is intended to show the directions and intensity of change and to identify the factors responsible. It provides a mechanism for studying the relationships among the items in a system — how making a single change ripples throughout a system, in other words, creating some positive and intended consequence as well as unintended results. It has been produced by The Millennium Project since 2000.