The document discusses Sistemas de Actuación por Cooperación (SAC) in Mexico City. SACs are planning tools that seek to coordinate public, private, and social sectors to implement strategic urban projects that benefit communities. SACs guide development to be sustainable, prosperous, participatory, and equitable. They promote investment and efficient land use to improve infrastructure, transport access, and territorial equity. The document outlines the process for establishing a SAC and how they operate through technical committees and agreements between stakeholders. It lists several SACs already established in Mexico City and their objectives to regenerate urban areas, generate social and economic equity, and improve quality of life through coordinated projects.