Herbert William Heinrich, author of Industrial Accident Prevention, A Scientific Approach, devised a way of understanding the relationship between unsafe acts and workplace injuries. He illustrated this with a triangle diagram, such as the version shown in Figure 1.
Here, for every 600 unsafe acts 30 near misses are likely to occur, 10 minor injuries and one major injury. The U.S. Bureau of Labor statistics reports 2,236 work-related fatalities in 2017 due to falls, contact with objects and equipment, exposure to harmful substances or environments, and fires and explosions. In the same year, workers experienced 882,700 injuries that caused them to miss work afterward.