This is a simple, linear cause-and-effect model where accidents are seen as the natural culmination of a series of events or circumstances that occur in a specific and recognizable order. The model is often represented by a chain with a weak link or a series of falling dominos. In this model, accidents are prevented by fixing or eliminating the weak link, by removing a domino or by placing a barrier between two dominos to interrupt the series of events. The Domino Theory of Accident Causation, developed by H.W. Heinrich in 1931, is an example of a sequence of events model.
