Violence between partners (IPV) has become a major societal challenge. Since 2001 in Belgium, a public policy has been concerted between the Federal State, the Communities and the Regions, involving multiple sectors and actors: police, justice, health, aid and assistance or education. The objective of the IPV-PRO&POL project was to study the issue of IPVs as much from the perspective of the impact of the phenomenon and the complexity of the processes involved as from the perspective of the public policy practices developed, and more particularly the effectiveness of multi-level governance and transversal practices. The research took place during a period marked by the #MeToo movement (2017), the evaluation of the Istanbul Convention implementation and political debates within the Senate, as well as the pandemic crisis during the last phase of the research.