European cities face complex challenges that demand smart solutions. This project puts urban intermediaries, those people who can bring people and resources together in innovative ways, at the heart of smart urban development and sets out to understand how they create social innovation. We will carry out fieldwork in four European cities (Birmingham, Copenhagen, Glasgow and Amsterdam) where we will develop collaborative working groups, or 'living labs', which will be sources of data as well as sites for learning across projects, fields of practice, cities and countries. In sum, we will advance knowledge of how intermediaries innovate and generate smart urban development, by creating opportunities for collaborative research, dialogue and learning across Europe.