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The identification of police officers who have potential problems has emerged as a popular approach for curbing police misconduct and achieving accountability. Early warning (EW) systems are data-driven programs whose purpose is to identify officers whose behavior is problematic and to subject those officers to some kind of intervention, often in the form of counseling or training. Because of their potential for providing timely data on officer performance and giving police managers a framework for correcting unacceptable performance, early warning systems are consistent with the new demands for performance evaluation raised by community policing and the effective strategic management of police departments. This article identifies essential components of EW systems and explains the characteristics, structure, and processes of a model program.