Today, many urban development projects strive to create active frontages or active ground floors, that is, ground floor facilities characterized by transparency and plenty of activity. However, this is difficult to achieve, especially in new constructions. Also, there is limited research on planning practices related to active ground floors. The studies that do exist also tend to have a limited view of what an active ground floor can be. Thus, the aim of this report is to generate knowledge on how different types of urban development actors can cooperate to generate ground floors in cities and communities that are not only active, but also mixed. The report pursues its aim by reviewing a case of inter-organisational planning in the district of Masthuggskajen in the city of Gothenburg, Sweden. The report demonstrates several activities and practices that partaking organisational actors got involved in as a means of jointly trying to enforce active ground floors in the area. As part of this, the actors repeatedly came to shift between different ways of framing what an active ground floor in Masthuggskajen can be as well as ways of valuing different plans, designs and routes of action. The study also puts light on several sources of friction and uncertainty that arose as part of the process, as well as practices that functioned as a means of coordinating the work. The report does not provide any definitive answers as to how actors should cooperate to generated active and mixed ground floors. It does, however, contribute with knowledge on what kinds of activities, documents, coordination mechanisms etcetera that might be employed by actors when striving to create active and mixed ground floors.