The second phase of the project ‘Formal-Informal Interface’ was developed comparatively between four African cities: Cairo, Dar es Salaam, Lusaka and Ouagadougou, engaging the formal-informal interface with four themes: mobility, water infrastructure, food chain and housing development, respectively. Throughout the span of the study, a number of workshops were carried out, aiming at developing a comparative research framework between four African cities, and an exchange of methods and skills among the participating urban research initiatives from each city. The project is supported by the African Urban Research Initiative (AURI): “Fostering a Comparative Research Agenda in African Cities.” The project is supported by the African Urban Research Initiative (AURI): “Fostering a Comparative Research Agenda in African Cities.”