Life is full of decisions, but not all decisions are made equal. Choices can be big and consequential (should I focus on my success, family, or passion), or small and everyday (going out, or staying in). This course will introduce you to the cognitive science of judging and choosing. You will learn about rational planning, the kind a perfect intelligence might carry out; Common simplifications and shortcuts that non-perfect humans use, and how these may actually be appealing approximations for any decision-making system; Regret over choices taken and not taken; Making decisions with others, Transformative decisions, the ones that change who you are as a person. As we cover these topics, we will consider how to apply the insights from the psychology of decision making to your own ordinary and extraordinary choices.