The FBI reports crime data in the Uniform Crime Report (UCR), including the number of arrests, crimes reported, and officers. This data is reported as a rate per 100,000 people and as a percentage change from previous years. Part I offenses in the UCR include serious crimes like murder, while Part II offenses are less serious crimes. The National Crime Victimization Survey directly surveys people about their experiences as crime victims, which can provide information about unreported crimes. Criminology is the scientific study of crime and criminal behavior. Theories like social disorganization theory and social process theories examine how social forces influence criminal behavior.