This analysis by Brazilian professor Patricia Maria Emerenciano de Mendonça looks at the history of Sector-State negotiations over Law No. 13.019, Brazil’s landmark legislation on sector-State collaboration in publicly-funded CSO activities and in policymaking. The paper explores the challenges of implementing that law at the local government level by examining three case studies: the state of Bahia and the municipalities of Florianopolis and Belo Horizonte. The paper concludes with a series of practical recommendations to assist CSOs and local officials to collaborate on more effective implementing regulations for the law in Brazil’s more than 5,000 states and municipalities. Available in Portuguese only.