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Probability (P)
1
Extremely unlikely
Virtually impossible or No known occurrences on similar products or
processes, with many running hours
2
Remote
Relatively few failures, once in a year max.
3
Occasional
Occasional failures, might happen or have happened already (2 to
11 times per year)
4
Reasonably Possible
Possible failures, might happen or have happened already (1 to 3
times per month)
5
Possible
Possible failures, might happen or have happened already (1 to 2
times a week)
6
Frequent
Frequentfailures, might happen or have happened already (10 times
+ per month), affects almost every tretment session…