Transit Oriented Development (TOD) is a strategic approach in urban planning that promotessustainable urban growth through efficient land use and enhanced public transportation. This thesisexplores the implementation of TOD within a Swedish context through a case study on the developmentof Flemingsbergsdalen in southern Stockholm. This is done through interviews with different actorsinvolved in the development process. The study aims to understand how TOD is adapted to andimplemented in Flemingsbergsdalen and to identify the primary challenges encountered in the TODimplementation process. The research revealed two primary findings. Firstly, the implementation of TOD in Flemingsbergsdalenadheres closely to recognised design and planning principles of TOD, reflecting both the historical andcontemporary planning contexts. Flemingsbergsdalen's development, informed by early TOD initiativesin Flemingsberg, illustrates how evolving planning ideas contribute to and shape the built environment.Secondly, the study identifies three main categories of challenges: financing TOD, defining roles andresponsibilities, and managing internal and external organisation. These challenges highlight thecomplex interplay between economic factors and institutional roles, significantly influenced by bothformal and informal institutional factors such as budgeting, economic priorities, and the varying levelsof stakeholder knowledge and experience in navigating financing processes for TOD projects. The findings suggest that while TOD principles are well-supported in theory, the process ofimplementation is filled with complex challenges that can be difficult to navigate. This thesis contributesto research by identifying and categorising these challenges and providing a framework forunderstanding the dynamics between them.