Regarding to the fuzzy system complexity is almost exempt to fuzzy system will practices his functions by required way promptly after his programmed. It is necessary tuning phase. It is not expediency to change all parameters which can influenced behavior system and also shapes of his transfer characteristic. Usual are tuning „just“ shapes and positions logical function input and output terms other parameters are fixed (if they are not demonstrably wrong select).
Problem is exacting and lengthy. To be just not accidental „wandering in darkness“ is useful to come to realize how is influence the shape of transfer characteristics by partial hits.