OASC is a not-for-profit global network of cities and communities founded in 2015. It embodies a singular, global, demand-side consensus on the minimal common ground for exchanging solutions, services and data between cities. This common ground is called the ‘Minimal Interoperability Mechanisms’ (MIMs). OASC members are cities, towns, and rural areas of planet earth, as jointly defined by the EU, OECD, World Bank, FAO, UN-Habitat, and ILO. OASC members strive to collaborate, learn, share, implement, innovate, and replicate, in order to act as catalysts for the global adoption of local solutions that further sustainable development goals as defined by the international community. OASC membership is completely free and universally accessible to all cities, towns, and rural areas, irrespective of size, means, geography, location, or other factors. OASC members can join OASC by joining an OASC Chapter consisting of at least two members. OASC members are represented in the Council of Cities, the Board of Directors, the General Assembly, and the Working Groups of OASC. OASC members can represent themselves, be formally represented by another member, or be formally represented by an elected not-for-profit and non-commercial organisation. OASC members formally adopt, endorse, support, and advance the Minimal Interoperability Mechanisms and their underlying principles of open data, open APIs, open access, and 'driven by implementation'. The Council of Cities, representing all OASC cities, holds the final verdict on what becomes a MIM and what references are contained therein. The Council of Cities - without exception - represents the so-called 'demand side' of the market. Nowhere in the governance of OASC, are decisions made by companies or individual commercial interests. This ensures an open and level playing field, and ultimately an addressable and interoperable global market.