Shift2Sustain aims to promote sustainable urban mobility by driving behavioural change through improved Mobility Management Plans (MMPs) and Measures (MMMs). To this aim, Shift2Sustain focuses on (1) generating a database of information on existing MMPs and MMMs to understand their impact, success factors, and challenges, (2) developing assessment methods based on environmental, economic and social KPIs, (3) testing innovative approaches to understanding MMMs uptake and implementation, using gamification, serious games and behavioural incentives, and (4) empowering stakeholders and guarantee knowledge transfer. These four aims will be achieved through comprehensive data collection on current MMPs and MMMs to identify best practices and obstacles, pilot testing in seven cities to evaluate the effectiveness of different sustainable mobility strategies, stakeholder engagement and co-creation, development of evidence-based recommendations, including digital tools and policy guidelines for urban mobility planning, and knowledge dissemination, via open-access platforms, training programs, and partnerships with local authorities. Shift2Sustain aligns with the EU Sustainable and Smart Mobility Strategy, supporting the transition to low-carbon and energy-efficient urban transport. The project contributes to the EU Cities' Mission by integrating technical solutions with behavioural insights. Additionally, its focus on stakeholder involvement, policy alignment, and innovative transport solutions ensures that results can be widely applied across European urban contexts.