Many people want their lives to make a difference and, if you’re reading this book, you’re probably one of them. As Trevor Field’s story illustrates, however, good intentions can all too easily lead to bad outcomes. The challenge for us is this: how can we ensure that, when we try to help others, we do so as effectively as possible? How can we ensure that we avoid inadvertently causing harm and have the greatest positive impact we can? This book tries to help answer these questions. I believe that by combining the heart and the head – by applying data and reason to altruistic acts – we can
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