A Research Story by Murray Sidman. How does the work of Sidman and his coworkers on equivalence relations fit into science and into life? Why were the experiments really done (the Journals never let you tell the whole story)? How did the researchers feel about what they were doing? Much new material, along with reprints, shows the ups and downs, moments of joy along with frustrations, intellectual triumphs and puzzles, intricacies of the reasoning process--and, of course, data. Clearly, Sidman is uncomfortable without data; he has spent his life gathering new data, thinking about it, and working out the next steps. Here is his story.

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