  This paper proposes two kinds of fuzzy abductive inference in the framework
of fuzzy rule base. The abductive inference processes described here depend on
the semantic of the rule. We distinguish two classes of interpretation of a
fuzzy rule, certainty generation rules and possible generation rules. In this
paper we present the architecture of abductive inference in the first class of
interpretation. We give two kinds of problem that we can resolve by using the
proposed models of inference.
