Ciclo is a system of door to door separate household waste collection in low-income communities to be carried out with solar-powered quadricycles. It is designed for the city of Rio de Janeiro, Brazil. The project envisages the scaling up of the service by executing it during the sporting events that will be hosted by the city in the next years, as well as in the most advanced - in terms of innovation and sustainability - neighbourhoods of the city. Rio de Janeiro produces 10 000 tons of waste every day (half of it is domestic) and recycles just the 3% of it. The most of the recycling material is collected by informal workers called "catadores" without proper tools. These are at the base of the chain of resellers who speculate on the commercialization of recyclables. Actually the separate waste collection presents big gaps and is not introduced in the whole city. The municipality is working on a program of implementation and development of the selective waste collection, which plans the construction of six stations for the collection, separation and commercialization of recyclables to be executed by "catadores" cooperatives.The aims of the project are:- first, to integrate the use of low-emission vehicles in the municipal program of implementation and development of the selective waste collection, covering areas which are not currently included by the program itself;- to establish a network of actors, which interact in a sustainable way, overcoming the intermediate resellers chain of the recycling market;- to integrate marginalized people who already operate in the context, improving their socioeconomical conditions by offering them formal work opportunities;- finally, to act as an agent of sustainable change, improving the living conditions of the populationand creating awareness about the mportance of a correct use and disposal of resources. The thesis is part of an open project fostered by the Department of Innovation for Sustainability of Politecnico di Milano which aims at spreding sustainable mobility systems through the activation of various pilot projects which can be developed in different low-income contexts, in collaboration with universities, local companies, NGOs and administrations.The work consisted at first in identifying an intervention context in the city of Rio and carrying out a strategic analysis, in order to generate solutions oriented to sustainability. A set of promising strategic possibilities - which helped to get to the formalization of the actual concept vision - was then generated. Finally, the system was developed on a more specific level in order to be ready for the implementation. The results of the project are:- the identification and involvement of a network of stakeholders (defining their roles, motivations and mutual interactions), which took part in the co-design process and set the bases for the implementation of the project;- the proposal of a concept vision for a sustainable Product-Service System and an hypothesis of transition path toward the introduction and scaling up of the innovation;- the design of a self standing pilot project capable to be reproduced and multiplied in similar contexts;- the design of a small-scale socio-technical experiment, aimed at learning and exploring how to improve the PSS innovation and how to contribute to its societal embedding;- the design of the scaling up process.