van Fraassen, Bas (1941–)

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Bas van Fraassen was born in Goes, in the Netherlands, on April 5. He lived in Holland until he was fifteen years old, when he moved with his family to Canada. After finishing his undergraduate studies in philosophy (with honors) at the University of Alberta in 1963, he went to the University of Pittsburgh for his Ph.D., which he completed in 1966 with a dissertation on the causal theory of time that was supervised by Adolf Grünbaum. He taught at Yale University, the University of Toronto, and the University of Southern California before moving to Princeton University, where he has been a Professor of Philosophy since 1982.

Van Fraassen has made seminal contributions to several areas of philosophy, and his work can be roughly divided into three major "periods": (i) the philosophical logic phase (19661979); (ii) the constructive empiricist period (19801993); and (iii) the empirical stance phase (1994 to the present). But throughout these periods, there has been a unified vision underlying his approach, with two crucial features: (a) the search for an empiricist (antirealist and, in a sense, antimetaphysical) approach to science and philosophy more generally; and (b) an attempt to preserve through this empiricism "classical" features of the domain under considerationby taking scientific theories literally, retaining classical logic whenever possible, and resisting the need for introducing causally irrelevant items (such as possible worlds).

In the philosophical logic phase, this vision is articulated through the development of several proposals guided by techniques from philosophical logic. For instance, van Fraassen's method of supervaluations provides a way of retaining classical logic (or, at least, classical logic's theorems), even in the presence of truth-value gaps. This method can then be used to accommodate logical paradoxes, such as the Liar ("This sentence is not true"). Van Fraassen's early work on space-time theories also illustrates the empiricist component of the vision, with the development of interpretations of space-time theories that do not presuppose the existence of absolute space (1970). Moreover, in his development of a semantics for free logic, van Fraassen assumed only existing individuals in the domain, thereby avoiding a commitment to nonexistent objects that early work in the area had presupposed. Finally, van Fraassen's early theory of meaning relations among predicates and modality does not involve any commitment to real modalities in nature.

Several of these problems can be approached from a unified perspective with the development of constructive empiricism (van Fraassen 1980). This is a view about the aim of science: the search for empirically adequate theories. The constructive empiricist articulates something novel: an empiricist alternative to scientific realism that avoids the early pitfalls of logical positivism. As opposed to logical positivism, the constructive empiricist takes scientific theories literally; there's no attempt to reformulate such theories in some formal language. And as opposed to scientific realism, the constructive empiricist puts forward an interpretation of science in which scientific theories need not be true to be good, as long as they are empirically adequate (and informative). To flesh out the proposal, van Fraassen argues that it is possible to make sense of scientific methodology from this viewpoint, and highlights, in particular, the crucial role played by models in scientific theorizing. He develops a new version of the semantic approach to scientific theories, insisting that to present a theory is to specify a class of models rather than to provide a list of axioms in a formalized language. As opposed to earlier positivist proposals, van Fraassen's work articulates a theory of the pragmatics of explanation that does not require scientific theories to be true for them to be explanatory. He also advances a new interpretation of probability that is compatible with the rejection of real modalities in nature.

Constructive empiricism's lack of commitment to metaphysically dubious notions (at least from an empiricist perspective)such as laws of nature, possible worlds, and real modalities in natureis developed further in van Fraassen's book Laws and Symmetry (1989). The book argues that attempts to characterize the notion of law of nature are doomed to failure because either they are unable to justify the inference from It is a law that P to P, or they fail to identify the features that make P a law in the first place. As an alternative, van Fraassen suggests that many roles that traditional philosophical proposals have assigned to laws of nature can be accommodated without commitment to the latterprovided we examine the role played by symmetry (roughly, transformations that leave certain structures invariant). A detailed case for this proposal in the context of quantum mechanics and a thorough development of an empiricist view of quantum theory is then articulated in Quantum Mechanics: An Empiricist View (1991).

After the development of the details of constructive empiricism, a more general question arises: How is it possible to be an empiricist instead of just developing an empiricist approach to science? To elaborate a broader perspective on empiricism that includes constructive empiricism as a particular case is a major goal of van Fraasen's empirical stance (2002). Instead of articulating empiricism as a doctrine (a set of beliefs), van Fraassen insists that empiricism should be conceptualized as a stance: an attitude, an epistemic policy. This move has several advantages. First, it avoids the incoherence of certain earlier empiricist proposals that failed to meet their own empiricist standards and ended up being meaningless or lacking any content. Second, the move also provides a novel way of understanding our practice, in particular the role of experience in our epistemic life, and how to make sense of scientific revolutions as a decision problem. The crucial features of van Fraassen's earlier works are also found here, notably in the development of an empiricist perspective that preserves the "classical" features of the phenomena under consideration.

See also Empiricism; Laws of Nature; Liar Paradox, The; Logical Paradoxes; Philosophy of Science, Problems of; Pragmatics; Presupposition; Realism.


Churchland, P. M., and C. A. Hooker, eds. Images of Science: Essays on Realism and Empiricism, with a Reply by Bas C. van Fraassen. Chicago: The University of Chicago Press, 1985.

van Fraassen, B. C. The Empirical Stance. New Haven, CT: Yale University Press, 1991.

van Fraassen, B. C. An Introduction to the Philosophy of Time and Space. New York: Random House, 1970.

van Fraassen, B. C. Laws and Symmetry. Oxford: Clarendon Pres, 1989.

van Fraassen, B. C. Quantum Mechanics: An Empiricist View. Oxford: Clarendon Press, 1991.

van Fraassen, B. C. The Scientific Image. Oxford: Clarendon Press, 1980.


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van Fraassen, Bas (1941–)

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