Heinrich and beyond



In this article, the author will summarize and review Heinrich's work originally published in 1931. The author will then supplement that original work with accident data collected and compiled by the United States Bureau of Labor Statistics over a recent 17-year period. This additional data will then be used to expand the top layer of Heinrich's Triangle to include accidents resulting in OSHA recordable cases, lost workday cases, and fatalities. The result will be an updated version of Heinrich's Triangle consisting of five levels instead of the original three. These will start at the top with accidents resulting in fatalities and work down through lost workday cases, OSHA recordable incidents and first-aid cases to accidents with no injuries. Analysis of this additional data will lead to some interesting and significant conclusions about the validity of the underlying data. © 2010 American Institute of Chemical Engineers Process Saf Prog, 2011