This is a book about how to make better decisions. We make thousands of decisions every day, from minute choices we don't even know we're making up to great, agonising deliberations. But when every decision we make is life-changing, the way we reach them matters. And for every decision, there is noise. This book teaches us how to understand all the extraneous factors that impact and bias our decision-making - and how to combat them and improve our thinking. Filled with new science, fascinating case studies and revealing practical examples, the skills this book teaches can be readily used by private or public institutions, by schools, hospitals, businesses, judges and in our everyday lives.