Falsification, rejection, and modification

Summary

In two articles Friedrich Rapp argues that there is a methodological symmetry between falsification and verification in contradistinction to the logical asymmetry that obtains between them. (The Methodological Symmetry between Verification and Falsification,Ztschr. f. Allg. Wissth., Band VI/1 (1975), pp 139–144; A Helpful Argument — Reply to K. Eichner,Ztschr. f. Allg. Wissth., Band VII/1 (1976), pp. 121–123). Rapp puts forward the thesis that methodological falsification of a theory T implies the acceptance of an inference from ∼ (x) Tx to (x) ∼ Tx. However, this thesis does not have to be accepted even if the premises of Rapp's argument were accepted. Furthermore, Rapp has not shown that the falsification of a theory T implies that T will not be retained. Neither has Rapp formulated assumptions that are sufficient to guarantee that the outcome of an intended test of a theory T can be considered as an outcome of an actual test of T.