Table 3 Need for mitigation measures according to risk level.

From: An interpretable framework for risk management in TBM excavation using expert elicitation integrated with fuzzy set theory

Risk level

Need for mitigation measures

Negligible [N]

Mitigation measures are unnecessary

Tolerable [T]

Mitigation measures not recommended but can be taken depending on the situation

Significant [S]

Mitigation measures recommended but cannot be taken depending on the situation

Intolerable [I]

Mitigation measures are necessary

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