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High hazard and high vulnerability conditions combined suggest that impact will be high. Conversely a weak hazard with low vulnerability should result in a low impact. Moderate impact could be expected with either of two combinations – strong hazard and low vulnerability or weak hazard with high vulnerability. Reducing vulnerabilities may have the greatest practical impact with natural hazards, as a vulnerability reduction strategy would move High impact events into the Moderate category (for high vulnerability situations with strong hazards) or into the Low category (for Moderate impact with weak hazards). I would suggest that the reverse is true for human generated hazards.