Offender profiling is an investigative tool used by law enforcement agencies to identify likely suspects (descriptive offender profiling) and analyze patterns that may predict future offenses and/or victims (predictive offender profiling). Offender profiling dates back to 1888 and the spree of Jack the Ripper, and the profiling theory describes how profiling will ideally work. Current applications include predictive profiling, sexual assault offender profiling, and case linkage (using profiling to identify common factors in offenses and to help with suspect identification).