Table 3.

Fuzzy rating and leveling of Probability sub-criteria.

Level	P1	P2	P3
Very High	Failure is almost inevitable (3 month)	Same failure in 3 months	It is not visible at all
High	Repeated failure (3-6 month)	Same failure in 3-6 months	Visible while using the device
Moderate	Occasional failure (6 month to 24 months)	Same failure in 6-24 months	Visible between two inspection intervals
Low	Relatively few failure (2-5 year)	Same failure in 2-5 years	Visible while inspecting
Rare	Failure is ulikely (5 year)	Failure is ulikely (5 year)	Visible before an inspection