City Crime Dynamics Lab (3D)

Drag police to reposition - use the mode buttons to add police or lamps

citizenoffenderpolicelamp

City statistics (live)

Crimes and arrests per 5 s, disorder (line)

Model: offenders attack suitable targets that lack capable guardians (routine activity theory, Cohen and Felson 1979). Disorder raises risk and spreads (broken windows, Wilson and Kelling 1982); collective efficacy makes bystanders intervene and cleans disorder (Sampson et al. 1997). Police presence deters; hot-spot patrols follow recent crime (Sherman and Weisburd 1995). A stylised teaching model, not a predictive one.