Measuring research impact and engagement is a hot topic in the UK and internationally. This book is the first to provide a critical review of the research impact agenda, situating it within international efforts to improve research utilisation. Using empirical data, it discusses research impact tools and processes for key groups such as academics, research funders, 'knowledge brokers' and research users, including the increased use of metrics proposed by the Stern review. Ideally timed for the next REF in 2021, it draws on theories about science, knowledge and policy to suggests ways to improve research impact.