Hi Ines,

Your dilemma is not a dilemma at all. As the name implies Fuzzy method is vague and you cannot base the safety decision on vague conclusions. I have deeped my toes in investigating  possible application of Fuzzy approach  to the safety cases. It can shed some light on the safety issue, but not much. I have not seen the application of Fuzzy methods in real industrial ( I am in offshore oil and gas industry) cases. 

When you rule out everything which is irrelevant, then the remaining item worth perusing. 

The context to use Fuzzy number is just to publish paper for the like minded people.

The context for probabilistic method is any situation which involves  certitudes. There is a very good track record for it. 

Hi Yasseri, all my greeting for your response. I do understand your opinion.

Hi Ines,

Thank your greetings.  I looked your profile. and I gather you are primarily academic, hence number of papers are important to you. Producing papers  based on Fuzzy logic is easier in comparison with probabilistic methods. But if you wish liaison  probabilistic methods takes you along way. 

Currently all high risk industry (nuclear, aviation, offshore, to name only a few) use probabilistic methods for their safety assessment.  However, the degree of sophistication  varies but as time goes by  they are catching up with the academic world. 

There are also  a number of papers that  apply Fuzzy numbers to the safety issue with a little success. However, I have yet to see Fuzzy logic applied to actual cases.  

Safety cases for the nuclear industry takes a few years to produce and  you can bury the author using his/her reports (they are that many). When it finishes they go back to the beginning again and go through another round. All of their calculations are probabilistic. 

Thank you  for all

Thank you for jour response.

I do understand your response.  Thank you