 If one thinks about some of the examples that Heisenberg considers to be measurements, it is even clearer than in von Neumann’s case that the movability of the Heisenberg cut in fact requires decoherence. In particular, his discussion of \(\alpha\)-particle tracks involves successive measurements whenever the \(\alpha\)-particle ionises an atom in a cloud chamber. If we require that the Heisenberg cut be movable to the level of the entire cloud chamber, we shift directly to a Mott-type analysis of the \(\alpha\)-particle tracks.