Systematic Approach of TOPSIS Decision-Making for Construction Method Based on Risk Reduction Feedback of Extended QFD-FMEA

Table 2

Evaluation criteria for accident frequency.

Occurrence frequency	Evaluation value
∼1/10,000 (very frequent)	5
∼1/100,000 (frequent)	4
∼1/1,000,000 (occasionally)	3
∼1/10,000,000 (rarity)	2
∼1/100,000,000 (very rare)	1