This course introduces incoming students in the Master in City Planning (MCP) program to the theory and history of planning in the public interest. It relies primarily on challenging real-world cases to highlight persistent dilemmas: the power and limits of planning, the multiple roles in which planners find themselves in communities around the globe, and the political, ethical, and practical dilemmas that planners face as they try to be effective. As such, the course provides an introduction to the major ideas and debates that define what the field labels “planning theory,” as well as a (necessarily) condensed global history of modern planning.