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Previous studies have shown that, after being trained on A-B and A-C matching tasks, subjects match not only functionally-same Band C stimuli (stimulus equivalence), but also BC compounds with sameclass elements and BC compounds with different-class elements (equivalence-equivalence). Similar performances are required in classical analogies (a : b :: c : d). Therefore, some researchers have argued that equivalence-equivalence can serve as a behavior analytic model for analogical reasoning. Recent studies, however, have shown that compounds with same-class elements and different-class elements have different discriminative (S+, S-) properties. Hence, matching of same discriminative functions may have occurred. The present study aimed to design an equivalence-equivalence test in which the designated correct performances cannot be attributed to a process other than matching functionally-same relations. In Experiment 1 , subjects were trained to relate X and Y stimuli to colors and X and l stimuli to forms. After equivalence was assessed (Y-Xl) , the subjects received an equivalence-equivalence test in which only compounds with same-class elements were used: an XY or Xl compound as sample and an XY and Xl compound as comparisons (e.g., X1Y1-X2Y2IX2Z2). All subjects passed the equivalenceequivalence test. However, as reported by 1 subject, and was later demonstrated in Experiment 2, these equivalence-equivalence tasks could be solved by matching functionally-same stimuli (e.g., Y1-colorY2, hence Y1-Y2). Experiment 3 demonstrated that this problem also exists in classical analogy tasks. When given the analogy tasks used by Goswami and Brown (1990), all subjects selected the correct dterm option on the basis of the b-term alone (equivalence). In Experiment 4, the equivalence-equivalence test was further modified to permit differentiation of matching functionally-same relations from matching functionally-same stimuli. All 5 subjects readily matched functionally-same equivalence relations, thus evidenced equivalence-equivalence or analogical reasoning.