Surveillance is the monitoring of behavior. Systems surveillance is the process of monitoring the behavior of people, objects or processes within systems for conformity to expecte or desired norms in trusted systems for security or social control. Clinical surveillance refers to the monitoring of diseases or public health–related indicators (for example symptoms indicating an act of bioterrorism) by epidemiologists and public health professionals. The word is pronounced /sɚˈveɪəns/ or /sɚˈveɪləns/.