An engineer was adjusting the gear box of a large steam engine while it was in operation and dropped a wrench into the path of the gears. As a result the engine was thrown out of alignment and badly wrecked. Luckily the engineer only suffered minor lacerations from ejected pieces of metal. It was hypothesized by the engineer that the metal handled wrench simply slipped out of his oily hands
a) Use the domino and multiple causation theories to examine this accident scenario.
b) Use job safety analysis to suggest control measures (and indicate relative effectiveness for each) that could have prevented the injuries and damage. What is your ultimate recommendation?