The goal of this research is to develop an instrument for working with justice in urban development projects for urban professionals such as policy makers, urban planners and designers. The instrument will provide them with the tools to set up participatory processes for the development of urban areas where conflicting interests and perspective on justice form a challenge in working towards a just solution for a shared ambition. The plans for the future of de Wallen, Amsterdam’s Red Light District, will function as a case study for this research. There, conflicting interests have formed a challenge in creating a shared vision for the future of the neighborhood, mainly regarding the presence of sex work. The instrument will be developed in co-creation with the stakeholders of the neighborhood, with a focus on the involved policy makers and designers as the changemakers.