Accidents most often involve what can be called a “confluence of circumstances.” It’s also known as the domino theory, developed by W.H. Heinrich, a pioneer in the area of industrial safety. His 1930s work has been updated by others, leading to such things as the “multiple causation theory,” MORT (Management Oversight and Risk Tree), and the Canadian Centre for Occupational Health and Safety accident causation model.The bottom line is that there are normally several causes when things go wrong. The more barriers you put up, the less likely something bad is going to happen.These human performance tools are designed to
