Wrong measurement for safety when we are consumed with personal safety not process safety. Not all hazards are the same or can cause equal consequences . Personal or occupational safety hazards such as slip , falls , cuts and vehicle accidents usually affect one individual worker on the other hand , process safety hazard  may cause major accidents involving the release of potentially dangerous materials , fires and explosions or both . Process safety incidents can have catastrophic effects and can result in multiple injuries and fatalities , and substantial economic , property and environmental damage - BP Deepwater Horizon oil disaster is the blowout of the Macondo well which resulted in explosion and uncontrolled fire on board the Deepwater Horizon , eleven people lost their lives  & 17 were seriously injured, Deepwater Horizon sank and the Macondo well discharged hydrocarbons into the Gulf of Mexico for nearly three months before it was contained . On march 23, 2005 ,  BP Texas City Refinery experienced a catastrophic process accident . This incident took the lives of 15 workers and injured more than 170 . The BP refinery was celebrating a safety record at the time of explosion . This safety record was devoid of the true measurements of the current status of the facility , it was solely based on personal safety -not process safety .

That is why process safety measurement should focus on the design and engineering of facilities, inspection , maintenance , management of change , hazard assessment , incident investigation and alarms , operating and maintenance , procedures , training of people and human factors