National Archive of Criminal Justice Data (NACJD)Facilitates research in criminal justice and criminology, through the preservation, enhancement, and sharing of computerized data resources; through the production of original research based on archived data; and through specialized training workshops in quantitative analysis of crime and justice data. NACJD is home to websites for two separately maintained programs: the Project for Human Development in Chicago Neighborhoods (PHDCN) and the Terrorism and Preparedness Data Resource Center (TPDRC).