Effective police leaders become adept at responding to challenge. Like other organizations, police agencies must balance constancy and predictability with adaptation and change. Even as they strive to standardize operations, most police leaders recognize the fluid context in which their agencies operate. They also understand that there are forces to which police organizations must adapt and evolve in order to remain effective in a changing world. It is those forces that drive organizational change and create new models for conducting the business of policing.