The document provides guidance on selecting a dissertation topic and defending a dissertation proposal. It discusses considering how much you enjoy the topic, whether the topic is relevant to important unanswered questions, and ensuring the topic is on the leading edge of research methods. The document also advises taking time to explore different topics while not delaying too long, and positioning the topic at the frontier of knowledge. Finally, it states the goal of defending the proposal is to obtain feedback, and outlines steps like choosing knowledgeable committee members and preparing the defense to maximize feedback.