thank you and sorry for the delay in answering, I had lost your reply.
Regarding the uncertainty of each parametr of a PS, I have understood that the standard deviation is in the same unit of the flow, and not in percentace %.
Regarding the sensitivity analysis, my model is full parameterized, but I don't know how to performe the sensitivity analysis to assess the processes or parameters that affect most the results.
I would like to identify the most influencing and carry out the monte carlo analysis only on these process/parameters, since I have about 100 of them.
Thank you very much,