This document discusses the theory of broken windows policing. It begins by defining broken windows and explaining that disorder leads to increased crime. It then contrasts liberal and conservative views on the causes of crime. The origins of broken windows policing are explored through the ideas of Robert Peel, Jane Jacobs, Philip Zimbardo, and James Q. Wilson and George L. Kelling. The document analyzes how broken windows policing was implemented in New York City under Mayor Giuliani and Police Commissioner Bratton and explores its impact on reducing crime. Some criticisms of broken windows are addressed.