The document discusses the governance and collective action challenges of managing common pool resources or commons. It defines commons as natural or socially constructed resources that are large enough that exclusion of users is difficult. Managing commons requires collective action to coordinate use while maintaining sustainable production. The document reviews different frameworks for analyzing commons issues, including the "tragedy of the commons" perspective, different property rights systems, and Elinor Ostrom's work on institutional design principles for long-enduring management of commons. It emphasizes that successful governance depends on rules fitting the social-ecological context and polycentric systems with multiple decision-making centers.