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One young man with autism was trained in botanical skills. He was trained to match different drawings of trees (c), shown with Their respective names (a), and tree leaves (b) using a conditional discrimination procedure. The conditional discrimination Procedures were arranged as a many-to-one training structure (ac and bc) followed by a test block for equivalence responding. Two different procedural arrangements for training the conditional discriminations—sequential and concurrent presentation of Trials—were compared. Furthermore, follow-up tests after 10 and 12 weeks and 8 months were included to test for the stability Of derived relations. The participant showed responding in accordance with equivalence with 4 different stimulus sets following Conditional discrimination training on both a sequential and a concurrent basis. The results showed that the equivalence Responding was more stable in the follow-up tests following the sequential arrangement of training than after the concurrent Arrangement.