Sustainable Urban Mobility Planning (SUMP) has been developed and, to various extent, applied throughout the EU during the 2010s. Apart from handling subject matters of sustainable mobility, SUMPs unavoidably involve issues of governance and the handling of a variety of institutional aspects. Broadening the system boundaries of sustainable mobility with an accessibility focus and accommodating uncertainty by foresight methods further adds to institutional and governance complexity in SUM planning. As part of the research project Triple Access Planning for Uncertain Futures, this working paper provides an overview of institutional and governance issues which influence sustainable urban mobility planning. The paper attends to the research questions (1) - what does the literature say about the influence of institutional and governance conditions over sustainable urban mobility planning processes?, and (2) - what do insights from research literature imply for SUMP practice? Based on searches in the Scopus and TRID databases, a final selection of 36 articles was made as a basis for overarching insights about the nature of institutional and governance aspects of SUMP that needs to inform the enhancement of the SUMP guidelines. It is found that planners need to be aware of local context; to stick to basic planning principles but allow practical discretion. Institutional and governance factors needs to be attended to throughout the planning process. The literature also points to that there are limits to integration and participation in SUM planning. Planners should consider where and when these aspects icontribute the most. Planning also need to accommodate processual reflexivity, iteration, and local discretion, and the planning organisation would benefit from developing its institutional capacity for handling a developed SUM planning when it comes to a broad pespective on accessibility and uncertainty. Based on these insights and a critical analysis of the current SUMP framework that is informed by the reviewed literature, some modifications of the SUMP process model is brought forward to better acknowledge institutional and governance aspects of  sustainable mobility planning.