hierarchical fuzzy inference system HOWTO?

I am using the fuzzy framework and it seems that I am too dumb to find a solution?
My system should use several inference systems and I simply don't know how to send the fuzzy result of one inference system as fuzzy input to the next inference system.
Of course a workaround would be do defuzzify and use the crisp value as new input, but to do so would result in loss of information.
Can anyone give me a clue?
Thanks a lot
joern
My system should use several inference systems and I simply don't know how to send the fuzzy result of one inference system as fuzzy input to the next inference system.
Of course a workaround would be do defuzzify and use the crisp value as new input, but to do so would result in loss of information.
Can anyone give me a clue?
Thanks a lot
joern