The World Barometer of Cultural and Religious Pluralism aims to measure the intensity of identity tensions within a society, and its ability to absorb shocks between different sets of values to preserve the common good. It is an indicator usable to prevent violent conflicts and to identify in advance threats of massacres and genocides, and a necessary tool for building peaceful and inclusive societies. The Barometer aims first to reflect reality by gathering, analyzing and publishing relevant information on pluralism in various countries, starting with France, Lebanon and Mali. In the long term, these results will be used as a basis for advocacy to increase knowledge, understanding and awareness among civil society, academics and policy makers.