Book excerpt: Territorial Development and Action Research examines the role of action research within fields such as territorial development and innovation. Most researchers analyse these fields from the outside, developing a theoretical understanding of what should be done, but not of how to do it. Based on their own experience of territorial development processes from the inside out, James Karlsen and Miren Larrea argue that filling the gap regarding social relations in the innovation process makes it possible for researchers to engage in the processes taking place in the territory, thereby revealing how to make things work. This book will help researchers face the pressure to engage and play a useful role in the development of their host regions. It will help policy makers to continuously learn and redefine policy approaches and bring about collaboration through networks, programs and projects where researchers and practitioners in regional, local and urban development work together to construct territorial development. Readers will acquire a better understanding of micro-territorial development processes and the roles played by individuals and coalitions in endogenous development processes.