The influence of training structure on the formation of equivalence relations and equivalence-equivalence relations was assessed. Three groups learned conditional relations using different training structures: Many to One, One to Many and Linear Series. The results showed a training structure effect on the percentage of correct responses in the equivalence relations test. However, this effect was not observed on the test of equivalence-equivalence relations. These results show that training structure has effects on the formation of equivalence relations, but it has no influence on equivalence-equivalence relations. These findings are analyzed according to the requirements for the formation of equivalence-equivalence relations.