Just making a decision can be hard enough, but how do you begin to judge whether it's the right one? This title focuses on decades of psychological research to explain why we so often get it very badly wrong - why our supposedly rational brains are frequently tripped up by powerful biases and wishful thinking. Contents: 1. The four villains of decision making 2. Avoid a narrow frame 3. Multitrack 4. Find someone who's solved your problem 5. Consider the opposite 6. Zoom out, zoom in 7. Ooch 8. Overcome short-term emotion 9. Honor your core priorities.