Scientific Explanation

The modern search for an adequate general theory of explanation is an outgrowth of the logical positivist’s agenda: to lay the groundwork for a general unified theory of science. Carl Hempel and Paul Oppenheim’s “Studies in the Logic of Explanation” (Hempel and Oppenheim 1948, cited under the Deductive-Nomological Model of Explanation) was the first major attempt to put forth an account that met the positivist’s criteria. It initiated a lively debate that has continued up to the present. But as the attention of the philosophers of science became increasingly focused on the individual sciences, it quickly became clear that one general theory of explanation would not do since the particulars of the various sciences called for different accounts of what constituted an adequate explanation in physics and biology as well as chemistry, etc. This article attempts to capture the flavor of the debates and the nature of the shifting targets over the years. It does not profess to be complete, being largely restricted to work published in English, but it is a start. While the modern debates surrounding explanation can be said to begin with Hempel and Oppenheim, the history of philosophical accounts of explanation can be traced at least to Aristotle, whose metaphysics set the logical framework for explanations until Galileo urged that appeals to metaphysical categories be replaced by mathematics and measurement. For the most part, Galileo was not interested in appealing to causes or occult forces. The account of how things behaved was to be expressed in the language of mathematics. Descartes tried to capitalize on that insight with his resurrection of medieval discussions of causation relying on Aristotle’s framework framed in a mathematical physics, only to be countered by Newton, who introduced non-Aristotelian causal explanation grounded in mathematical physics. Finally John Stuart Mill begins the long march to contemporary accounts of causal explanation in both the physical and the social sciences, again relying on certain key assumptions about human nature. So the history of explanation is long and intertwined with a variety of metaphysical frameworks. The Positivists of the 20th century unsuccessfully eschewed metaphysics and sought to create an account of causal explanation that somehow aimed to stick strictly to the dictates of science, only to be thwarted by the metaphysical assumptions in the sciences themselves.