This book by Nick Cooney entitled "How to be great at doing good" that explores the most efficient ways to use charitable donations to create the greatest positive impact. Cooney examines why traditional methods of giving often fall short of their intended goal, and he argues that instead of relying on empathy or instinct, donors and charities alike should adopt a more calculated approach, focusing on tangible results and "cost per good done." The book presents a compelling case for shifting focus to charities with high impact and low overhead, emphasizing the importance of data-driven decision-making and testing to improve effectiveness.