Verificationism and (Some of) its Discontents


  • Thomas Uebel University of Manchester



Verificationism has had a bad press for many years. The view that the meaning of our words is bound up with the discernible difference it would make if what we say, think or write were true or false, nowadays is scorned as “positivist” though it was shared by eminent empiricists and pragmatists. This paper seeks to sort through some of the complexities of what is often portrayed as an unduly simplistic conception. I begin with an overview of its main logical empiricist varieties before considering which aspects of it fall victim to which of the three major types of objection that have been raised against it. I will conclude that what is left standing is a modest proposal that seems worth further investigation.

Author Biography

Thomas Uebel, University of Manchester



Achinstein, Peter and Stephen F. Barker, eds., 1969. The Legacy of Logical Positivism. Baltimore: John Hopkins Press.

Andreas, Holger, 2017. “Theoretical Terms in Science.” Stanford Encyclopedia of Philosophy,, accessed 20 May 2019.

Anscombe, G. E. M., 1959. An Introduction to Wittgenstein’s Tractatus. London: Hutchison.

Awodey, Steve and André Carus, 2007. “The Turning Point and the Revolution. Philosophy of Mathematics in Logical Empiricism from Tractatus to Logical Syntax.” In The Cambridge Companion to Logical Empiricism, edited by A. Richardson and T. Uebel, pp. 165–92. Cambridge: Cambridge University Press.

Ayer, Alfred J., 1936. Language, Truth and Logic, 1st ed. London: Gollancz.

———, 1946. Language, Truth and Logic, 2nd ed. London: Gollancz.

———, 1959a. “Editor’s Introduction.” In Ayer (1959b), pp. 3–28.

———, ed., 1959b. Logical Positivism. New York: The Free Press.

———, 1963. “Carnap’s Treatment of the Problem of Other Minds.” In Schilpp (1963), pp. 269–81.

———, 1979. “Replies.” In Perception and Identity, edited by Graham Macdonald, pp. 277–333. London: Macmillan.

Berlin, Isaiah, 1938–1939. “Verification.” Proceedings of the Aristotelian Society 39: 225–48.

Carnap, Rudolf, 1928a. Der logische Aufbau der Welt. Berlin: Weltkreisverlag. Translated into English in Carnap (2003), pp. 3–300.

———, 1928b. Scheinprobleme in der Philosophie. Berlin: Weltkreisverlag. Translated into English in Carnap (2003), pp. 301–343.

———, 1932a. “Die physikalische Sprache als Unversalsprache der Wissenschaft.” Erkenntnis 2: 432–65. Translated into English as The Unity of Science, by M. Black. London: Kegan, Paul, Trench Teubner and Co., 1934.

———, 1932b. “Überwindung der Metaphysik durch logische Analyse der Sprache.” Erkenntnis 2: 219–41. Translated into English as “The Elimination of Metaphysics through Logical Analysis of Language,” by A. Pap, in Ayer (1959b), pp. 60–81.

———, 1934a. Logische Syntax der Sprache. Vienna: Springer. Revised and translated into English as The Logical Syntax of Language, by A. Smeaton. London: Kegan, Paul, Trench, Tuebner and Co., 1937; reprint Chicago: Open Court, 2002.

———, 1934b. “Meaning, Assertion and Proposal.” Philosophy of Science 1: 359–60.

———, 1934c. “On the Character of Philosophic Problems.” Philosophy of Science 1: 5–19.

———, 1936a. “Die Methode der logischen Analyse.” In Actes du 8e Congrès Internationale de Philosophie, Prague 1934, pp. 142–45. Prague: Orbis.

———, 1936b. “Diskussionsbemerkung.” In Actes du 8e Congrès Internationale de Philosophie, Prague 1934, p. 244. Prague: Orbis. Translated in English as “Discussion,” by B. Linsky in Ingarden (1936), pp. 5–6.

———, 1936c. “Über die Einheitssprache der Wissenschaft. Logische Bemerkungen zum Project einer Enzyklopädie.” In Actes du Congrès Internationale de Philosophie Scientifique, Sorbonne, Paris 1935, vol. 2, Unité de la Science, pp. 60–70. Paris: Hermann & Cie.

———, 1936d. “Von der Erkenntnistheorie zur Wissenschaftslogik.” In Actes du Congrès Internationale de Philosophie Scientifique, Sorbonne, Paris 1935, vol. 1, Philosophie Scientifique et Empirisme Logique, pp. 36–41. Paris: Hermann & Cie.

———, 1936e. “Wahrheit und Bewährung.” In Actes du Congrès Internationale de Philosophie Scientifique, Sorbonne, Paris 1935, vol. 4, Induction et Probabilité, pp. 18–23. Paris: Hermann & Cie.

———, 1936–1937. “Testability and Meaning.” Philosophy of Science 3: 419–71 and 4: 1–40. Reprinted with corrections and additions, New Haven: Yale Graduate Philosophy Club, 1954.

———, 1939. Foundations of Logic and Mathematics. Chicago: University of Chicago Press.

———, 1949. “Truth and Confirmation.” In Essays in Philosophical Analysis, edited by H. Feigl and W. Sellars, pp. 119–27. New York: Appleton-Century-Crofts.

———, 1955. “Meaning and Synonomy in Natural Language.” Philosophical Studies 7: 33–47. Reprinted in Meaning and Necessity, 2nd ed., pp. 233–47. Chicago: University of Chicago Press, 1956.

———, 1956. “The Methodological Character of Theoretical Concepts.” In The Foundations of Science and the Concepts of Psychology and Psychoanalysis, edited by H. Feigl and M. Scriven, pp. 38–76. Minneapolis: University of Minnesota Press.

———, 1958. “Beobachtungssprache und theoretische Sprache.” Dialectica 12: 236–48. Translated into English as “Observational Language and Theoretical Language,” in Rudolf Carnap. Logical Empiricist, edited by J. Hintikka, pp. 75–85. Dordrecht: Reidel, 1975.

———, 1963. “Intellectual Autobiography” and “Comments and Replies.” In Schilpp (1963), pp. 3–84, 859–1013.

———, 2003. The Logical Structure of the World / Pseudoproblems in Philosophy, translated by R. A. George. Berkeley: University of California Press. Reprint Chicago: Open Court, 2003.

Carnap, Rudolf, Hans Hahn and Otto Neurath, 1929. Wissenschaftliche Weltauffassung—Der Wiener Kreis. Vienna: Wolf. Translated into English as “The Scientific Conception of the World—The Vienna Circle,” in Empiricism and Sociology, by O. Neurath, edited by M. Neurath and R. S. Cohen. pp. 299–318. Dordrecht: Reidel. Revised translation “The Scientific World-Conception: The Vienna Circle,” in Wissenschaftsliche Weltauffassung. Der Wiener Kreis, edited by F. Stadler and T. Uebel, pp. 75–116. Vienna: Springer.

Carus, André, 2007. Carnap and Twentieth Century Thought. Explication as Enlightenment. Cambridge: Cambridge University Press.

Church. Alonzo, 1949. Review of Language, Truth and Logic, 2nd ed., by A. J. Ayer. Journal of Symbolic Logic 14: 52–53.

Clark, Peter and Bob Hale, eds., 1994. Reading Putnam. Oxford: Blackwell.

Creath, Richard, 1976. “Kaplan on Carnap on Significance.” Philosopical Studies 30: 393–400.

———, 1982. “Was Carnap a Complete Verificationist in the Aufbau?” In PSA 1982, vol. 1, pp. 384–93. East Lansing: Philosophy of Science Association.

———, 1996. “Verifiability Principle.” In The Encyclopedia of Philosophy. Supplement, edited by P. Edwards, pp. 578–80. New York: Macmillan.

———, 2009. “The Gentle Strength of Tolerance: The Logical Syntax of Language and Carnap’s Philosophical Programme.” In Carnap’s Logical Syntax of Language, edited by P. Wagner, pp. 203–16. Basingstoke: Palgrave Macmillan.

———, 2014. “(Anti-)Metaphysics in the Thirties: And Why Should Anyone Care Now?” In European Philosophy of Science: Philosophy of Science in Europe and the Viennese Heritage, edited by M.-C. Galavotti, E. Nemeth and F. Stadler, pp. 67–76. Dordrecht: Springer.

Dreben, Burt, 1994. “In Mediis Rebus.” Inquiry 37: 441–47.

Duhem, Pierre, 1906. La Theorie Physique: Son Object Sa Structure. Paris: Chevalier & Rivière. Translated into English as The Aim and Structure of Physical Theory, by P. Wiener. Princeton: Princeton University Press, 1954.

Dummett, Michael, 1975. “What Is a Theory of Meaning?” In Mind and Language, edited by S. Guttenplan, pp. 97–128. Oxford: Oxford University Press.

———, 1976. “What Is a Theory of Meaning? (II).” In Truth and Meaning, edited by G. Evans and J. McDowell, pp. 67–137. Oxford: Clarendon Press.

Hahn, Hans, 1933. Logik, Mathematik und Naturerkennen. Vienna: Gerold. Partial English translation in Ayer (1959b), pp. 147–64; full translation in McGuinness (1987), pp. 24–45.

Haller, Rudolf, 1985. “Der erste Wiener Kreis.” Erkenntnis 22: 341–58. Translated into English as “The First Vienna Circle,” in Rediscovering the Forgotten Vienna Circle, edited by T. Uebel, pp. 95–108. Dordrecht: Kluwer.

Heath, A. E., 1934. “Communication and Verification III.” Proceedings of the Aristotelian Society suppl. vol. 13: 194–202.

Hempel, Carl Gustav, 1950. “Problems and Changes in the Empiricist Criterion of Meaning.” Revue International de Philosophie 4: 41–63. Reprinted in Ayer (1959b), pp. 108–29.

———, 1951. “The Concepts of Cognitive Significance: A Reconsideration.” Proceedings of the American Academy of Arts and Sciences 80: 61–77.

———, 1965. “Empiricist Criteria of Cognitive Significance: Problems and Changes.” In Aspects of Scientific Explanation, pp. 101–22. New York: The Free Press.

———, 1969. “Logical Positivism and the Social Sciences.” In Achinstein and Barker (1969), pp. 163–94.

Hymers, Michael, 2005. “Going around the Vienna Circle: Wittgenstein and Verification.” Philosophical Investigations 28: 205–34.

Ingarden, Roman, 1936. “Der logistische Versuch einer Neuorientierung der Philosophie. Eine kritische Bemerkung.” In Actes du 8e Congrès Internationale de Philosophie, Prague 1934, pp. 203–08. Prague: Orbis. Translated as “The Logical Attempt at a New Formulation of Philosophy: A Critical Remark,” by B. Linsky, Journal for the History of Analytical Philosophy 6.6: 1–6.

Justus, James, 2006. “Cognitive Significance.” In Philosophy of Science. An Encyclopedia, edited by S. Sarkar and J. Pfeiffer, pp. 131–40. Abingdon: Routledge.

———, 2014. “Carnap’s Forgotten Criterion of Empirical Significance.” Mind 123: 415–36.

Lakatos, Imre, 1970. “Falsification and the Methodology of Scientific Research Programmes.” In Criticism and the Growth of Knowledge, edited by I. Lakatos and A. Musgrave, pp. 91–196. Cambridge: Cambridge University Press.

Lazerowitz, Morris, 1938. “Meaninglessness and Conventional Use.” Analysis 5: 33–42.

Lewis, Clarence Irving, 1929. Mind and the World Order. New York: Scribners. Reprint New York: Dover, 1956.

———, 1934. “Experience and Meaning.” Philosophical Review 43: 125–46.

Limbeck-Lilienau, Christoph, 2010. “Rudolf Carnap und die Philosophie in Amerika. Logischer Empirismus, Pragmatismus, Realismus.” In Vertreibung, Transformation und Rückkehr der Wissenschaftstheorie, edited by F. Stadler, pp. 85–196. Münster: LIT. Excerpts translated in “Carnap’s Encounter with Pragmatism,” in Rudolf Carnap and the Legacy of Logical Empiricism, edited by R. Creath, pp. 67–88. Dordrecht: Springer, 2012.

Lowinger, Armand, 1941. The Methodology of Pierre Duhem. New York: Columbia University Press.

Lutz, Sebastian, 2017. “Carnap on Empirical Significance.” Synthese 194: 217–52.

Marion, Matthieu, 2012. “Wittgenstein, Ramsey and British Pragmatism.” European Journal of Pragmatism and American Philosophy 4: 1–26.

MacDonald, Margaret, 1933–1934. “Verification and Understanding.” Proceedings of the Aristotelian Society 34: 143–56.

McGuinness, Brian, ed., 1967. Wittgenstein und der Wiener Kreis. Gespräche aufgezeichnet von Friedrich Waismann. Frankfurt am Main: Suhrkamp. Translated into English as Wittgenstein and the Vienna Circle. Conversations Recorded by Friedrich Waismann. Oxford: Blackwell, 1979.

———, ed., 1987. Unified Science. Dordrecht: Springer.

Misak, Cheryl, 1995. Verificationism. Its History and Prospects. London: Routledge.

———, 2016. Cambridge Pragmatism. Cambridge: Cambridge University Press.

Mulligan, Kevin, 2017. “Brentano’s Knowledge, Austrian Verificationisms and Epistemic Accounts of Truth and Value.” The Monist 100: 88–105.

Nagel, Ernest, 1934. “Verifiability, Truth and Verification.” Journal of Philosophy 31: 141–48. Reprinted in Logic Without Metaphysics and Other Essays in the Philosophy of Science, pp. 143–52. Glencoe: The Free Press.

Neurath, Otto, 1931. “Physikalismus.” Scientia 50: 297–303. Translated into English as “Physicalism,” in Neurath (1983), pp. 52–57.

———, 1932. “Soziologie im Physikalismus.” Erkenntnis 2: 393–431. Translated into English as “Sociology and Physicalism,” in Ayer (1959b), pp. 282–320, and as “Sociology in the Framework of Physicalism,” in Neurath (1983), pp. 58–90.

———, 1935. “Pseudorationalismus der Falsifikation.” Erkenntnis 5: 353–65. Translated into English as “Pseudorationalism of Falsification,” in Neurath (1983), pp. 121–31.

———, 1936. “Diskussionsbemerkung.” In Actes du 8e Congrès Internationale de Philosophie, Prague 1934, p. 245. Prague: Orbis. Translated in English as “Discussion,” by B. Linsky in Ingarden (1936), p. 6.

———, 1983. Philosophical Papers 1913–1946, edited by R. S. Cohen and M. Neurath. Dordrecht: Reidel.

Ogden, C. K. and I. A. Richards, 1923. The Meaning of Meaning. London: Routledge and Kegan Paul.

Pelletier, Francis Jeff and Bernard Linsky, 2018. “Verification: The Hysteron Proteron Argument.” Journal for the History of Analytical Philosophy 6.6: 7–36.

Popper, Karl, 1934. Die Logik der Forschung. Vienna: Springer. Translated into English with additions as The Logic of Scientific Discovery. London: Hutchison, 1958.

Putnam, Hilary, 1965. “How Not to Talk About Meaning.” In Boston Studies in the Philosophy of Science, vol. 2, edited by R. C. Cohen and M. Wartofsky, pp. 117–31. New York: Humanities Press. Reprinted in Putnam (1975), pp. 117–31.

———, 1969. “Logical Positivism and the Philosophy of Mind.” In Achinstein and Barker (1969), pp. 211–23. Reprinted in Putnam (1975), pp. 441–51.

———, 1975. Mind, Language and Reality. Philosophical Papers Vol. 2. Cambridge: Cambridge University Press.

———, 1981a. “Philosophers and Human Understanding.” In Scientific Explanation. Papers Based on the Herbert Spencer Lectures, edited by A. F. Heath. Oxford: Clarendon Press. Reprinted in Realism and Reason. Philosophical Papers Vol. 3, pp. 184–204. Cambridge: Cambridge University Press.

———, 1981b. Reason, Truth and History. Cambridge: Cambridge University Press.

———, 1982. “Beyond the Fact/Value Dichotomy.” Critica 14: 3–12. Reprinted in Realism with a Human Face, edited by J. Conant, pp. 135–41. Cambridge, MA: Harvard University Press, 1990.

———, 1994. “Comments and Replies.” In Clark and Hale (1994), pp. 242–95.

———, 2002. The Collapse of the Fact/Value Dichotomy And Other Essays. Cambridge, MA: Harvard University Press.

Putnam, Hilary and Vivian Walsh, eds., 2012. The End of Value-Free Economics. Abingdon: Routledge.

Quine, W. V., 1951. “Two Dogmas of Empiricism.” Philosophical Review 60: 20–43. Revised and reprinted in From a Logical Point of View, rev. ed., pp. 20–46. Cambridge, MA: Harvard University Press, 1980 [1953].

———, 1969. “Epistemology Naturalized.” In Ontological Relativity and Other Essays, pp. 69–90. New York: Columbia University Press.

———, 1991. “Two Dogmas in Retrospect.” Canadian Journal of Philosophy 21: 265–74.

Reichenbach, Hans, 1930. “Der physikalische Wahrheitsbegriff.” Erkenntnis 2: 156–71. Translated into English as “The Physical Concept of Truth,” in Selected Writings 1909–1953, vol. 1, edited by M. Reichenbach and R. S. Cohen, pp. 343–56. Dordrecht: Reidel, 1979.

———, 1938. Experience and Prediction. Chicago: University of Chicago Press.

———, 1951. “The Verifiability Theory of Meaning.” Proceedings of the American Academy of Arts and Sciences 80: 46–50. Reprinted in Readings in the Philosophy of Science, edited by H. Feigl and M. Brodbeck, pp. 93–102. New York: Appleton-Century-Crofts, 1953.

Richardson, Alan, 2007. “Carnapian Pragmatism.” In The Cambridge Comanion to Carnap, edited by M. Friedman and R. Creath, pp. 295–315. Cambridge: Cambridge University Press.

Ricketts, Thomas, 1994. “Carnap’s Principle of Tolerance, Empiricism and Conventionalism.” In Clark and Hale (1994), pp. 176–200.

Russell, Bertrand, 1936. Review of Language Truth and Logic, by A. J. Ayer. The London Mercury 33: 541–43. Reprinted in The Collected Papers of Bertrand Russell, vol. 10, A Fresh Look at Logical Empiricism, edited by J. G. Slater, pp. 331–33. London: Routledge.

Ryle, Gilbert, 1936. “Unverifiability-By-Me.” Analysis 4: 1–11.

———, 1951. “The Verification Principle.” Revue International de Philosophie 5: 243–50. Reprinted in Collected Papers, vol. 2, Collected Essays 1929–1968, pp. 287–93. London: Hutchison, 1971.

Rynin, David, 1957. “Vindication of L*G*C*L P*S*T*V*SM.” Proceedings and Addresses of the American Philosophical Association 30: 45–67. Reprinted in Essential Readings in Logical Positivism, edited by O. Hanfling, pp. 60–82. Oxford: Blackwell, 1981.

Schilpp, Paul A., ed., 1963. The Philosophy of Rudolf Carnap. La Salle, IL: Open Court.

Schlick, Moritz, 1930. “Die Wende in der Philosophie.” Erkenntnis 1: 4–11. Translated into English as “The Turning Point in Philosophy,” in Ayer (1959b), pp. 53–59, and in Schlick (1979), pp. 154–60.

———, 1931a. “Die Kausalität in der gegenwärtigen Physik.” Die Naturwissenschaften 19: 145–62. Translated into English as “Causality in Contemporary Physics,” in Schlick (1979), pp. 176–209.

———, 1931b. “The Future of Philosophy.” In Proceedings of the Seventh International Congress of Philosophy, Held At Oxford 1930, pp. 112–16. London: Oxford University Press. Reprinted in Schlick (1979), pp. 171–75.

———, 1932a. “A New Philosophy of Experience.” College of the Pacific Publications in Philosophy 1: 63–78. Reprinted in Schlick (1979), pp. 225–37.

———, 1932b. “Positivismus und Realismus.” Erkenntnis 3: 1–31. Translated into English as “Positivism and Realism,” in Ayer (1959b), pp. 82–107, and in Schlick (1979), pp. 259–84.

———, 1932–1938. “Form and Content.” In Gesammelte Aufsätze, pp. 151–250. Vienna: Springer. Reprinted in Schlick (1979), pp. 285–369.

———, 1934. “Über das Fundament der Erkenntnis.” Erkenntnis 4: 79–99. Translated into English as “The Foundation of Knowledge,” in Ayer (1959b), pp. 209–27, and in Schlick (1979), pp. 370–87.

———, 1936. “Meaning and Verification.” Philosophical Review 45: 339–69. Reprinted in Schlick (1979), pp. 456–81.

———, 1937. “L’École de Vienne et la Philosophie Traditionelle.” In L’Unité de la Science: la Méthode et les Méthodes. Traveaux du IXe Congrès Internationale de Philosophie IV, pp. 99–107. Paris: Hermann & Cie. Translated as “The Vienna School and Traditional Philosophy,” in Schlick (1979), pp. 491–98.

———, 1979. Philosophical Papers Vol. 2: 1925–1936, edited by H. Mulder and B. van de Velde-Schlick. Dordrecht: Reidel.

Soames, Scott, 2003. Philosophical Analysis in the Twentieth Century. Princeton: Princeton University Press.

Stebbing, L. Susan, 1933. “Logical Positivism and Analysis.” Proceedings of the British Academy 19: 53–87.

———, 1934. “Communication and Verification I.” Proceedings of the Aristotelian Society suppl. vol. 13: 159–73.

Stein, Howard, 1992. “Was Carnap Entirely Wrong, After All?” Synthese 93: 275–96.

Stevenson, Charles L., 1944. Ethics and Language. New Haven: Yale University Press.

Uebel, Thomas, 2003. “On the Austrian Roots of Logical Empiricism. The Case of the First Vienna Circle.” In Logical Empiricism. Historical and Contemporary Perspectives, edited by P. Parrini, W. Salmon and M. H. Salmon, pp. 67–93. Pittsburgh: University of Pittsburgh Press.

———, 2007. Empiricism at the Crossroads. The Vienna Circle’s Protocol-Sentence Debate. Chicago: Open Court.

———, 2011. “Beyond the Formalist Meaning Criterion. Philipp Frank’s Later Anti-Metaphysics.” HOPOS 1: 47–72.

———, 2013. “Early Logical Empiricism and its Reception: the Case of the Vienna Circle.” In The Handbook of the History of Analytical Philosophy, edited by M. Beaney, pp. 518–45. Oxford: Oxford University Press.

———, 2015a. “American Pragmatism and the Vienna Circle: The Early Years.” Journal for the History of Analytical Philosophy 3.3: 1–35.

———, 2015b. “Three Challenges to the Complementarity of the Logic and the Pragmatics of Science.” Studies in History and Philosophy of Science 53: 23–32.

———, 2018. “Carnap’s Transformation of Epistemology and the Development of his Metaphilosophy.” The Monist 101: 367–87.

Waismann, Friedrich, 1930. “Logische Analyse des Wahrscheinlichkeitsbegriffs.” Erkenntnis 1: 228–48. Translated into English as “A Logical Analysis of the Concept of Probability,” in Philosophical Papers, edited by B. McGuinness, pp. 4–21. Dordrecht: Reidel, 1977.

Weinberg, Julius, 1936. An Examination of Logical Positivism. London: Routledge and Kegan Paul.

Wittgenstein, Ludwig, 1922. Tractatus Logico-Philosophicus. London: Routledge and Kegan Paul. Revised edition 1933; reprint 1983.

———, 1967. Über Gewissheit / On Certainty, edited by G. E. M. Anscombe and G. H. von Wright. Oxford: Blackwell.

Wright, Crispin, 1993. “The Verification Principle.” In Realism, Meaning, and Truth, 2nd ed., pp. 302–20. Oxford: Blackwell.

Yi, Byeong-Uk, 2001. “Compact Entailment and Wright’s Verification Principle.” Mind 110: 413–21.