What is NIBRS
In contrast to the FBI's Uniform Crime Report (UCR) summary-level data collection and reporting system, NIBRS is incident-based. Law enforcement agencies collect and submit detailed information about crime incidents and arrests.
For Group "A" offenses, a Group "A" Incident Report is prepared. Each report contains 6 data segments and comprises a total of 53 data elements. The data segments are administrative, offense, property, victim, offender, and arrestee. An initial submission of a Group "A" Incident Report must include data for the administrative, offense, victim, and offender data segments. Property and arrestee segments are submitted if and when they apply. For the 11 Group "B" offenses, only an arrest report is required when an arrest occurs.