Transition Economics' proven mature policies sustain good lives and societies at the same time that they bolster economic growth in 95% of the countries that adopt them. This Maturity Models guide introduces the new science of Transition Economics by discussing the implications of modeling government policymaking. Transition Economics Maturity Models is a subset of the full introduction and reference manual titled "Transition Economics - the Science of Sustainability".Policies in housing, energy, interest rates, debt, and social problems - total eighteen measures in all. TE Maturity Models compare these policies in 180 countries to confirm why 72% of all nations are in a collapse trending today. TE-Mature nations advance economically in 95% of cases and Maturity Models explain how to direct resets for your country policies in a phased approach and framework. Transition Economics is the Science of Sustainability. Ensuring that people have the things they need to keep economies working well, sufficient incomes, and renewed spending-power - is the goal of every TE-Maturity Modeled Policy.In large democracies, we must teach voters when they are in high school to understand the civics lessons proven to sustain the American Dream in any country.