Logic: The Theory of Inquiry

Overview

About five hundred and sixty pages, John Dewey’s systematic treatise on logic, published in 1938 when Dewey was seventy-nine years old, the culmination of a lifelong philosophical project he had been working toward across decades of earlier writing on experience, inquiry and scientific method. Of Dewey’s major works, this is generally considered the most technically demanding, addressed more directly to professional philosophers and logicians than to the broader educated readership his more accessible books, including Democracy and Education and How We Think, had reached.

The book’s central and genuinely distinctive move is definitional: Dewey defines logic not as the study of fixed, unchanging formal structures existing independently of any actual process of human inquiry, the more traditional understanding of logic as a discipline, but as the theory of inquiry itself, with inquiry defined in turn as the controlled or directed transformation of an indeterminate, unsettled situation into one that has become determinate and resolved. This definitional move puts Dewey directly against two more traditional positions he consistently criticizes throughout the book: logical formalism, which treats logical structure as fixed and independent of any particular inquiry that happens to use it, and any view holding that logic simply reports or mirrors reality’s own pre-existing structure.

The argument

Inquiry as the transformation of indeterminate situations. Dewey’s foundational definition treats inquiry as beginning always from a genuinely indeterminate situation, one whose elements are confused, obscure or in conflict in some way that disrupts settled, confident action or belief, and proceeding through a controlled, directed process toward a determinate situation, in which the original elements have been reorganized into a coherent, unified whole that resolves the initial confusion or conflict. This definition makes inquiry, and therefore logic as Dewey understands it, a genuinely active, transformative process rather than a passive matter of simply observing or discovering pre-existing facts and relations.

Logical forms as products of inquiry, not prior conditions for it. Perhaps Dewey’s most philosophically distinctive and most contested claim is that logical forms themselves, the rules and structures traditional logic treats as fixed and given prior to any particular inquiry, are actually products of inquiry’s own extended history, forms that sustained practical and scientific inquiry has found, through actual use over time, to work reliably, and which have accordingly become stabilized into general rules for guiding further inquiry. On this account, logic does not exist as a fixed structure inquiry must conform to from outside, but develops from within the ongoing practice of inquiry itself, continuously revisable in principle even where, in practice, certain logical forms have become extremely well stabilized through extensive successful use.

Biological and cultural grounding. Dewey grounds his account of inquiry first biologically, treating human logical thought as a highly developed continuation of the basic problem-solving activity found throughout organic life generally, organisms actively adjusting to and transforming problematic situations in their environment rather than passively receiving fixed environmental conditions, before extending this biological grounding into a specifically cultural and social account of how distinctively human inquiry, mediated by language, communication and accumulated cultural practice, actually develops beyond this more basic organic foundation.

Judgment, propositions and terms. Working from these foundations, Dewey develops a detailed technical account of judgment, propositions and terms as functional components within the ongoing process of inquiry rather than as static logical units with fixed, context-independent meaning, treating logical form throughout as inseparable from the actual practice of formulating and testing claims within a directed inquiry aimed at resolving some genuinely indeterminate situation.

Mathematics and the logic of scientific and social inquiry. The book’s later chapters extend this general framework across specific domains, offering an account of mathematical reasoning consistent with Dewey’s broader instrumentalist approach to logical form, and working through the specific logic of scientific inquiry and, in a further extension with genuine social and political implications, the logic appropriate to social inquiry, arguing throughout against both rigid formalism and any view that would treat social and scientific inquiry as requiring fundamentally different, incommensurable logical methods.

How to read it

Read Dewey’s foundational definition of inquiry as the transformation of indeterminate into determinate situations as the interpretive key for the entire book, since nearly every subsequent technical argument, about judgment, propositions, mathematics, scientific method, develops directly from working out this foundational definition’s implications across different specific domains.

Approach Dewey’s claim that logical forms are themselves products of inquiry’s history, rather than fixed prior conditions inquiry must conform to, as the book’s most philosophically consequential and most genuinely contested move; understanding exactly what is at stake in rejecting traditional logical formalism in favor of this more historically and practically grounded account of logical form is essential to grasping what Dewey’s systematic logic is actually trying to accomplish.

Notice how consistently Dewey grounds even his most technical logical arguments in biological and cultural continuity, treating human logical inquiry as a highly developed but genuinely continuous extension of organic problem-solving activity rather than as a wholly separate, purely rational capacity operating independently of an organism’s practical engagement with its environment.

Pay attention to how the book’s extension into social inquiry carries real political implications consistent with Dewey’s broader lifelong commitment to democratic method, treating rigorous, self-correcting inquiry as applicable to social and political problems in ways structurally continuous with, rather than fundamentally different from, its application to natural scientific problems.

Read this book as the technical culmination of themes developed more accessibly elsewhere in Dewey’s work, particularly the account of reflective thought in How We Think and the naturalistic metaphysics of Experience and Nature, recognizing that this systematic logic represents Dewey’s most demanding, most fully worked-out attempt to unify these lifelong philosophical commitments into a single coherent theoretical system.

Questions it raises

• Does Dewey’s claim that logical forms are themselves products of inquiry’s own history, rather than fixed structures existing prior to and independently of inquiry, adequately account for the apparent necessity and stability of basic logical principles, or does this historicized, instrumentalist account risk making logic seem more contingent and revisable than it actually, in practice, appears to be?
• How successfully does Dewey’s biological and cultural grounding of inquiry bridge the gap between basic organic problem-solving and the highly abstract, technical reasoning found in advanced mathematics and theoretical science? Does treating these as genuinely continuous illuminate or obscure what is actually distinctive about sophisticated human logical and mathematical reasoning?
• What are the practical and political implications of extending Dewey’s logic of inquiry to social investigation, treating social and political problem-solving as structurally continuous with scientific method? Does this extension strengthen or overreach Dewey’s underlying naturalistic and instrumentalist framework?
• How does Dewey’s definition of logic as the theory of inquiry, rather than as the study of fixed formal structures, compare to more traditional and to more contemporary formal approaches to logic developed independently of his pragmatist framework? What genuine philosophical work does Dewey’s alternative definition accomplish that traditional formal logic does not?
• Given the book’s considerable technical difficulty relative to Dewey’s more accessible earlier work, what does this suggest about the relationship between the full systematic development of a philosophical position and its capacity to reach and influence a broader audience beyond professional philosophers?
• Dewey wrote this systematic logic at the very end of a long career developing related themes across many earlier books. Does this final systematic treatment successfully unify and complete his lifelong philosophical project, or does its genuine technical difficulty suggest unresolved tensions that his more accessible earlier work had been able to leave comfortably unaddressed?