How to combine descriptive and normative approaches in participatory urban planning: an experimental mixed-method implemented in the downtown district of Poznań, Poland

This article presents a tool for reaching consensus in the participatory planning of the conversion and renovation of an urban space. It is based on the main assumption of combining descriptive and normative approaches in the actions of experts. It is an innovative way to strengthen the possibility of expert assessment in the decision-making process concerning desired spatial transformations. The authors hereof resorted to their own long-term experience when elaborating a tool that can easily support the selection of the optimal solution for maximizing benefits and minimizing outlay. The issues presented herein refer to the Central European context, which is characterized by a low level of social trust and by contentiousness in making joint decisions. The tool presented herein can contribute to participatory planning practice by enabling an expert to select solutions that meet the highest eficiency criteria on more objective grounds. It can be used to identify the convergent expectations of various social groups, thus facilitating conflict mitigation and arrival at a consensus. As a result, it can underlie the process of building social trust.