The domino effect & Swiss Cheese theory of Accident

Accidents happen due to a series of interconnected factors, like a series of falling dominoes. The Swiss cheese theory of accidents suggests that accidents occur when multiple layers of defense have holes that align. Holding people responsible for holes in defense is reasonable at times, but in some cases, nobody can be blamed. Changes are made in training and manuals when unforeseen dangerous circumstances arise. Overall, accidents are a result of interconnected factors and the identification and mitigation of holes in defense.