STRO was established in Netherlands in 1970 with a strong focus on environmental issues and the impact of the monetary structure. In the 1980s STRO advocated proposals that were very innovative for their time such as replacing taxes on labor by eco-taxing and carbon dioxide emission rights. Over the last 20 years, STRO has focused its research and interventions in the monetary arena, driven by the evidence that money is a key determinant in the organization of all aspects of modern society. From 1995 onward, STRO’s Research and Development focused on the introduction of more effective and environmentally friendly currencies. Many tests were executed in Latin America and in parallel Cyclos software has been developed.