We make decisions all the time. It's so natural that we hardly stop to think about it. Yet even the smartest and most experienced among us make frequent and predictable errors. So, what makes a good decision? Should we trust our intuitions, and if so, when? How can we avoid being tripped up by cognitive biases when we are not even aware of them? You're About to Make a Terrible Mistake! offers clear and practical advice that distills the latest developments in behavioural economics and cognitive psychology into actionable tools for making clever, effective decisions in business and beyond.