Measuring research impact and engagement is a much debated 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, and considers the challenges and consequences of incentivising and rewarding particular articulations of research impact. It draws on wide ranging qualitative data, combined with theories about the science-policy interplay and audit regimes to suggest ways to improve research impact.