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Niels Bohr's doctrine of the primacy of "classical concepts" is arguably hismost criticized and misunderstood view. We present a new, careful historicalanalysis that makes clear that Bohr's doctrine was primarily an epistemologicalthesis, derived from his understanding of the functional role of experiment. Ahitherto largely overlooked disagreement between Bohr and Heisenberg about themovability of the "cut" between measuring apparatus and observed quantum systemsupports the view that, for Bohr, such a cut did not originate in dynamical(ontological) considerations, but rather in functional (epistemological)considerations. As such, both the motivation and the target of Bohr's doctrineof classical concepts are of a fundamentally different nature than what isunderstood as the dynamical problem of the quantum-to-classical transition. Ouranalysis suggests that, contrary to claims often found in the literature,Bohr's doctrine is not, and cannot be, at odds with proposed solutions to thedynamical problem of the quantum-classical transition that were pursued byseveral of Bohr's followers and culminated in the development of decoherencetheory.

Niels Bohr as Philosopher of Experiment: Does Decoherence Theory Challenge Bohr's Doctrine of Classical Concepts?