ABSTRACT
The Hiyari-Hatto activity is based on Heinrich’s Law, proposed by the U.S. safety engineer H.W.Heinrich in 1959, which defines the possibility of a major casualty occurring. According to this law, behind one major casualty there are 29 small casualties and some 300 experiences of Hiyari-Hatto events (near-miss events). Hiyari-Hatto events (near-miss events; literally translated from Japanese, “startle” or “cold sweat” events) are said to be the seeds of casualty, and they derive from the same causes as accidents do. Whether or not a particular Hiyari-Hatto becomes a casualty is only an indirect result of chance.
