 For this epistemological argument to work, the distinction between empirical adequacy and truth has to be well-founded. A significant part of The Scientific Image is devoted to that task. As described in Section 1.6, the constructive empiricist argues that one can make sense of the observable/unobservable distinction, even if observation is theory-laden. (If the distinction between observables and unobservables didn’t make sense, the concept of empirical adequacy would be incoherent.)