In our project we analyze the interactions between state and non-state, national, international and transnational actors in the field of internal security in transitional and developing countries. Under which conditions do different security actors contribute to the production of security as a public good, i.e. bound by the rule of law and provided on an equitable basis to all citizens? Is a novel form of security governance discernible in the cooperation between these diverse actors? To answer these questions we conduct a comparative and micro-analytical analysis of the production of security in two districts of Buenos Aires and two in Mexico City.