This paper discusses challenges, contradictions and progress from a transdisciplinary case study taking place in the municipality of Uddevalla, Sweden. The aim is to develop a ´living lab´ to support planners in their work and extend stakeholder engagement and public participation in the development of a sustainable public transport strategy. The stakeholders represent different sectors within the public and private sector at local as well as regional level. The living lab therefore becomes an arena for negotiation between different geographical levels and interests. As part of the main aim, we'll also identify and gain understanding of different meanings regarding attractive public transport, the needs of the users of public transport and urgent questions among the stakeholders and citizens. The theoretical perspective is drawn from studies that emphasise the need for new participatory practices, to address social sustainability in transport planning and to prevent social exclusion and isolation and studies highlighting relational spaces of participation. Three workshops will be held during spring 2016 in order to develop a nexus strategy based on key questions identified by the participants. The workshops will show how pluralism will be handled by the participants and whether the strategy will be based on consensus or conflicting interests.