Police history is dense in reform efforts, typically tied to two kinds of events — public perceptions of widespread corruption, and efforts to make the police more responsive to citizen oversight. The former, focusing on economic corruption, were common in the United States through the early and mid-twentieth century. Intelligence-Led Policing has been heralded both for its ability to make use of community policing endeavors and as a police strategy adept in the use of intelligence. It is increasingly in use in the United States. Crime mapping is the visual representation of crime information on a screen. It is tied to a variety of algorithms that permit the collation of crime patterns by type, area, time, and any of a wide assortment of variables. Police militarization has been described as "the process whereby civilian police are increasingly drawn from, and pattern themselves around, the tenets of militarism and the military model".