The main purpose of this dissertation was to analyze both structuring and characteristics of intersectoral arrangements, from the formulation to implementation instances of the projects, considering the role of state actors and civil society, as well their relations, as inherently dimensions of the analysis. In order to overcome the normative approaches regarding intersectoriality, we empirically analyzed two cases: the Oficina Boracea project, whose analysis was divided into initial moment of implementation (T0-2002/2004) and current moment (T1-2007/2016); and the De Braços Abertos (DBA), from its formulation in 2013 to 2016. Carved in different contexts and times, both were developed by São Paulo City Hall as breaking through experiences of homeless welcoming and caring, although attending to public in situations of social vulnerability with different subtlety. Through the methodology of social network analysis, this dissertation investigates the relational dynamics among actors and how these established relationships helped to define distinct patterns of intersectoriality. In general terms, we observed the factors that influenced the setting of three intersectoral arrangements. In the case of Boracea T0, the intersectoral and governance arrangements presented a clear focus on the Social Assistance Department and on the civil society organizations (CSOs), as well as an effective articulation with Health Department and some punctual relations with other sectors. In Boracea T1, we observed an intense articulation between implementing agents from CSOs and from Social Assistance and Health Departments, but with difficulties in reaching the top command in order to influence more structuring decisions. At last, in DBA the observed arrangement presents an effective articulation of five sectors of government and the CSOs, with flows well defined among the three bureaucratic levels involved. Thereby, we empirically verify that intersectorality, rather than a well-formulated management model, is the product of everyday interactions, pervaded by distinct combinations of factors that define the effectiveness of diverse arrangements.