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**Question?**• Which lock gates in division present the greatest potential risk to health and safety and therefore should be repaired first?**Step One: Criteria**• Assume criteria equally important (or not). • Reflect most important aspects of evaluating risk. • Define H, M, L scenarios for each criterion. • Use three or four evidence-based criteria.**Step Two: Rating**• Use expert judgment to critically evaluate the available information • Develop estimates for each “hazard” against criteria • Use letters or numbers but numbers do not represent an absolute measurement of risk only a relative means for comparison**Greatest Risk HHH HHM, HMH, MHH HHL, HLH, LHH, HMM, MMH,**MHM HLM, MHL, HML, LMH, MLH, MMM, LHM HLL, LHL, LLH, MML, LMM, MLM MLL, LML, LLMLeast Risk LLL Step Three: All Possible Combinations This is for equally weighted criteria. Unequal weights yield different listings.**Step Four: Rank Subjectively**• Establish rank according to descending relative risk • Identify subjective clusters.**Look at rankings, do they make sense?**Have you thought properly about this issue? If they do not, perhaps you did not consider all the most relevant criteria A new criteria may be added to more accurately reflect the assessors rationale for ranking Step Five: Add Criteria?**Suppose the following was added to our example**Criterion 4: Cost of emergency repair H = Major disruptions to navigation or power, much higher costs to repair M = Much higher costs to repair L = Same as scheduled repair Step Five: Add Criteria? (cont)