This document discusses risk management in project management. It defines project risk as an uncertain event that can positively or negatively impact project objectives. It identifies different types of risks and explains the risk continuum from unknown unknowns to known knowns. The document also outlines the five main components of risk management according to PMBOK: 1) define objectives, 2) identify risks, 3) qualify and quantify risks, 4) develop responses, and 5) control risks. It provides examples of identifying, analyzing, and responding to different types of risks in projects.