The sustainability of the political relationship between people and institutions has been measured by indicators that even if accomplished do not cease the revolutionary behavior. This research study is aimed at the formulation of a Political Sustainability Index (PSI) to measure institutional legitimacy. To calculate the level of PSI between Autocracy, Democracy, and Ecocracy, data coded from the country case studies; Mozambique and Sweden that adopted constitution were classified in one of three political regimes through three categories: electoral, central, and local authorities. Observing both countries, Ecocracy has been revealed as the highest form of PS that dissuades revolutionary behavior, while autocracy and democracy, are concerned with the projection of ideologies. Correlation analyses indicate that the two countries are facing different stages of PS, but with the same pathways evolving to Ecocracy, where ideological constitutions are neutralized by scientific evidence.