The Sentinel Event Notification System for Occupational Risks (SENSOR) reporting system was described. The SENSOR system was developed by NIOSH to assist states in identifying and targeting selected occupationally related diseases. The system consisted of a network of sentinel health care providers such as individual practitioners, laboratories, and clinics that identify and report cases of selected occupational disorders to a surveillance center. The surveillance center, which was usually located in the state health department, also interacted with the provider, analyzed the data, and directed intervention activities toward the individual cases, coworkers, and worksites from which cases were reported. The original SENSOR system was developed for six conditions, silicosis, occupational asthma, pesticide poisoning, lead poisoning, carpal tunnel syndrome, and noise induced hearing loss, that lent themselves readily to provider reporting. A set of guidelines was under development by NIOSH for the selected conditions to improve provider awareness and understanding of the conditions and promote uniform reporting among the participating states. Reporting, analysis, and action responses of the SENSOR system were discussed. The author concludes that SENSOR should not be regarded as the only approach for monitoring occupational illness and injury. It is, however, a major component in a proposed comprehensive surveillance system for occupational disease and injury in the United States.