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Published online by Cambridge University Press: 19 May 2011
Zeiler appreciates my organism-centered approach but believes that it issues from the wrong framework and focuses on the wrong phenomena. He is a “sharpener,” I a “leveler”; I believe that the full complexities of organisms in their natural environments should be the terminus, not the origin of our scientific enquiry. The study of schedule performance is oblique but not orthogonal to that terminus, and offers us a secure footing for the next step upward in complexity.