OSHA uses a mix of unprogrammed inspections and programmed inspections to ensure safety in the workplace. Unprogrammed inspections include investigating complaints and serious accidents involving fatalities, amputations, and in-patient hospitalizations. Programmed inspections include proactive approaches to specific workplace hazards or in high-hazard workplaces identified by analyzing injury/illness data and emerging threats. Just under half of all inspections are programmed. OSHA compliance officers become familiar with as many facts as possible about a workplace before initiating an inspection.