This introductory chapter provides an overview of the relationship between information technology and military power. Digital systems now mediate almost every effort to gather, store, display, analyze, and communicate information. As a result, military personnel now have to struggle with their own information systems as much as with the enemy. Local representations of the world must be coordinated with whatever distant reality they represent. When personnel can perceive things that are relevant to their mission, distinguish friend from foe, predict the effects of their operations, and get reliable feedback on the results, then they can fight more effectively. When they cannot do these things, however, then tragedies like friendly fire, civilian deaths, missed opportunities, and other counterproductive actions become more likely. If military organizations are unable to coordinate their representations with reality, then all of their advantages in weaponry or manpower will count for little. The chapter describes the organizational effort to coordinate knowledge and control as information practice. It argues that the quality of practice, and thus military performance, depends on the interaction between strategic problems and organizational solutions.