The reasoning mechanism of PTES can deal with both uncertain facts and uncertain rules in a formal way by employing possibilistic logic and fuzzyset theory as its logical basis.
Fuzzyset and fuzzylogic can rationally make mathematical description of the conditional similarity among the analogical objects and correctly determine the rule of the analogy.
利用模糊集与模糊逻辑可以对类比对象间的有条件性相似关系做合理的数学描述，准确确定类比的条件规则。
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Combining rough set theory with fuzzylogic technology, this paper has presented a method of gaining fuzzy control rules based on measured data.