This text focuses on the role of governments and administrations in the emergence, spread, development and differentiation of community and complementary currency schemes (CCs), highlighting their role as potential support for experimentation. This support can take many forms: technical, financial, fiscal, official and / or legal recognition. We present first the role of governments, mostly local, in the emergence and development of four generations of CCs. We distinguish then a series of modes of action of governments at central and local levels. This leads to identify the interest of being supported (greater professionalism, greater complexity and possibly greater impact) while emphasizing the risks linked to public support as well.
