Although many researchers have studied how project managers can use project control systems to minimize the gap between project planning and project implementation and to realize a product that meets a client's goals, the field lacks a survey of these studies. This article reviews the current literature on project control systems. In doing so, it overviews project management's primary bodies of knowledge (BoK), looking at arguments for and arguments against using each BoK's approach when managing different types of projects. It defines the purpose of project control systems, explains the nature and significance of project control, and explores several methods for identifying project control rules, methods that include analyzing project failures and assessing project threats. It also describes the tools and techniques--as well as the advantages and disadvantages--involved in practicing project control.