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During the initial hazard identification, we have most likely identified a number of events and enabling conditions that influence how an accident scenario develops. In this step, we need to identify any barriers that contribute to control the risk by (i) stopping the accident scenario from developing into an accident or (ii) reducing the consequences. There may also be other factors influencing the scenarios, negatively or positively, that should be included in the accident scenarios to be defined in step 4.2.