European cities face complex economic, social and environmental challenges. A great approach to face these challenges is living labs. This is where local governments engage in solving problems together with other stakeholders in urban developments. However, in order to make these labs as successful as possible clear guidelines are needed on the types of problems with which urban living labs are most suited to address, and how urban labs can be best organized and integrated into formal local government organizations. The URB@Exp project aims to create these much needed guidelines. The project shall develop these guidelines by reviewing experiences of urban labs, and conducting action research in urban labs in Antwerp, Belgium; Graz, Austria; Leoben, Austria; Maastricht, the Netherlands, and Malmö, Sweden.