The history of Fuzzy Systems is marked by two different visions of what a fuzzy set is, each having its correlated research program. For a long time one vision saw a fuzzy set as a function. The other vision saw it as a family of crisp sets. One took the logical implication as its paradigm, the other the associative memory. One spoke about fuzzy logic. The other spoke about system thinking (Negoita, 1981). Recently, the latter vision was markedly emphasized. What follows is an attempt to explain this trend.
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