As the gap between journalists and the public continues to grow, how can investigative newsrooms convince people that they still matter? “Impact journalism” may be one solution. For six months, Disclose and Rembobine, two independent news organisations from France, have been collecting best practices to understand how newsrooms around the world monitor, assess and evaluate the echoes of their investigations. This brand new guide to impact journalism, based on 30 interviews with researchers, editors and impact producers, will be presented for the first time at Dataharvest. Impact provides not only room for hope, but also a promising approach to increasing reader loyalty and foundation support.