The collaborative economy of digital platforms is growing exponentially, arising challenges and opportunities. It has become a priority for political agendas around the world, including Barcelona and Catalonia. The involvement of citizens is key. So is the promotion of the commons model as an opportunity to democratize the economy. Procomuns is a public policy co-creation forum, a collaborative policy forum for a collaborative economy. A space for co-design and development of proposals, solutions and strategies for the advancement of common collaborative economies in Catalonia.