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The Buckles-Petry Model is the first model that utilizes similarity relations (Zadeh, 1971) in the relational model. It was proposed by Buckles and Petry (1982a, 1982b, 1984). In this model, a fuzzy relation is defined as a subset of the following Cartesian product: P(D1) × ... × P(Dm), where P(Di) represents the parts set of a Di domain, including all the subsets that could be considered within the Di domain (having any number of elements). The data types permitted by this model are the following: • Finite set of scalars (labels) • Finite set of numbers • Fuzzy number set The meaning of these sets is disjunctive, that is, the real value is one belonging to the set.