In this book so far, I’ve introduced the key questions to help you think like an effective altruist: How many people benefit, and by how much? Is this the most effective thing you can do? Is this area neglected? What would have happened otherwise? What are the chances of success, and how good would success be? Now it’s time to examine how we apply those questions to the real world and put effective altruism into action. That is the subject of Part II.