"In February 1995 the Office of Juvenile Justice and Delinquency Prevention (OJJDP) entered into a cooperative agreement with the Institute for Intergovernmental Research to establish the National Youth Gang Center (NYGC). (For more information on the NYGC, see OJJDP Fact Sheet #28.) One of the major tasks assigned to the NYGC was to conduct periodic national surveys to obtain comprehensive data on youth gang problems. These surveys are designed to build on previous youth gang surveys in coverage of jurisdictions and use of multiple data sources. The first NYGC survey was designed to gather basic information on the universe of gang problem jurisdictions, generating knowledge on the scope and nature of youth gangs that would inform the design of subsequent surveys. It expanded previous surveys by including jurisdictions queried in the National Institute of Justice (NIJ) surveys, Maxson and Klein's gang migration study, Miller's 1980 gang survey (and expanded data base), and cities and towns represented in gang studies conducted by the National Drug Intelligence Center and the Bureau of Alcohol, Tobacco and Firearms. The survey included a random sample of jurisdictions with populations of 25,000 to 150,000 that were included in the 1994 NIJ survey. This makes the NYGC survey cumulative in its coverage. More than 2,000 other law enforcement agencies were also surveyed."
OJJDP Fact Sheet, No. 63; FS-9763
Office of Juvenile Justice and Delinquency Prevention: http://www.ojjdp.ncjrs.gov/