Impact has become a central part of the assessment criteria for academic worth. It has been adopted by many research funding bodies, and it is firmly embedded in the British Research Excellence Framework. However, a clear definition of impact remains elusive and guidance on how exactly to achieve it is often superficial. This concise, informative book analyses impact across the social sciences. It draws on the analysis of the most highly ranked British impact case studies from the 2014 Research Excellence Framework, as well as fifteen interviews with senior academics, providing a longitudinal and critical framing of impact. The author concludes with valuable recommendations of how and when scholars can achieve impact.