 It is no surprise that there are close relationships between the two enterprises. We only mention the fact that the reconstruction of theoretical terms by other terms that are more easily accessible is particularly urgent when the theoretical terms refer to the microscopic domain. This explains in particular why Ludwig is a supporter of a statistical interpretation of quantum mechanics, because more advanced interpretations such as the single-particle-state interpretation of the wave function, in his opinion, have no axiomatic basis. In the current debate on the interpretation of quantum mechanics, the statistical interpretation (or ensemble interpretation) plays only a marginal role and is, moreover, usually attributed to L. E. Ballentine (1970). The Wikipedia entry on the  ‘ensemble interpretation’  does not mention Ludwig at all. 