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If we are able to spot the unsafe conditions there is a high likelyhood that we can avoid the unsafe act, near miss and accident.
If we are able to alert each other and have a high safety awareness we would be able to stop the unsafe act, avoiding the near miss and accident.
If we miss the two first opportunities we still have one more chance to avoid the accident. Namely: report and discuss the near miss, in order to prevent the personal injury or accident to hull and machinery.
Basic skills for a safety person is to identify all those thing in accurate manner and also to provide the solution to overcome the hazard either from once behavioral factor or condition contributing.