Explanation

Lore & Background

The source article notes that an explanation is a set of statements usually constructed to describe a set of facts that clarifies the causes, context, and consequences of those facts. It may establish rules or laws, and clarifies existing rules or laws in relation to any objects or phenomena examined. In philosophy, an explanation is a set of statements which render understandable the existence or occurrence of an object, event, or state of affairs. Among its most common forms are causal explanation, deductive-nomological explanation (involving subsuming the explanandum under a generalization from which it may be derived in a deductive argument), and statistical explanation (involving subsuming the explanandum under a generalization that gives it inductive support). Explanations of human behavior usually rely on the subject's beliefs, desires and other relevant facts, operating under the assumption that the behavior in question is rational to some extent.

Reader's Guide

The article distinguishes explanations from arguments: arguments start from a doubted fact and try to support it, while explanations start with an accepted fact and ask why or what caused it. Arguments aim to contribute knowledge, whereas explanations aim to contribute understanding. The difference is often blurred in rhetorical use, causing difficulty in critical thinking. The article also notes that the term 'explanation' is sometimes used in the context of justification, but it is important to be aware when an explanation is not a justification—one may give a detailed account without giving a single proof. In scientific contexts, the notion of 'scientific explanation' suggests a contrast between explanations characteristic of science and those outside it, though recent philosophical literature assumes substantial continuity between scientific and ordinary explanations. A notable theory is Hempel's Deductive-nomological model, which has been widely criticized but remains the starting point for discussion.

Did You Know?

• The deductive-nomological explanation involves subsuming the explanandum under a generalization from which it may be derived in a deductive argument, e.g., 'All gases expand when heated; this gas was heated; therefore, t
• Statistical explanation involves subsuming the explanandum under a generalization that gives it inductive support, e.g., 'Most people who use tobacco contract cancer; this person used tobacco; therefore, this person cont
• Explanations of human behavior rely on the subject's beliefs, desires, and other relevant facts, assuming the behavior is rational to some extent.
• The difference between explanations and arguments is that arguments aim to contribute knowledge, whereas explanations aim to contribute understanding.

The Many Faces of Explanation

An explanation is fundamentally a collection of statements designed to illuminate the causes, context, and consequences behind a set of facts. It can establish new rules or clarify how existing laws apply to particular objects and phenomena. In philosophy, the core task is rendering the existence or occurrence of something understandable. Several canonical forms exist: causal explanations trace effects back to their sources; deductive-nomological explanations subsume a specific case under a general law from which it follows deductively, as when concluding a gas expanded because all gases expand when heated; statistical explanations rely on inductive generalizations, such as linking tobacco use to elevated cancer risk. Explanations of human conduct typically invoke the subject's beliefs, desires, and the assumption of some degree of rationality—so removing a coat might be explained by feeling hot, wanting relief, and believing the coat's removal would deliver it. Aristotle recognized four archetypal kinds of explanation long ago, and modern taxonomy extends further to include functional, historical, psychological, reductive, teleological, and methodological varieties.

Explanation Versus Argument

The boundary between explaining and arguing is one of the most practically important distinctions in critical thinking. An argument begins with a doubted claim and seeks to establish its truth; an explanation begins with an accepted fact and asks why or how that fact came to be. If two people disagree about whether a cat has fleas, one might point to the scratching as evidence—that is an argument. But once both agree the cat is infested, the question shifts to cause: perhaps the damp weather created favorable conditions. That shift from 'is it so?' to 'why is it so?' marks the move from argument to explanation. Arguments aim to contribute knowledge; explanations aim to contribute understanding. Yet in everyday rhetoric the two blur constantly. People frequently cannot tell which mode they are operating in, the same vocabulary serves both purposes, and the word 'explain' often appears inside arguments. Explanations are routinely embedded within arguments to function as supporting premises, which makes critical evaluation of claims considerably more difficult.

Theories and the Scientific Ideal

A persistent assumption in philosophical discussion is that science delivers a single, unified kind of explanation, distinct from the looser accounts we use in daily life. Recent literature, however, has tended to see substantial continuity between scientific and ordinary explanation, with the former simply embodying in a more precise, rigorous, and detailed form features that are present in a rougher way in the latter. The task of a theory of explanation, on this view, is to capture what is common to both. The most influential framework remains Hempel's deductive-nomological model, which, despite widespread criticism, still serves as the starting point for most subsequent theorizing. Competing and complementary approaches include the statistical relevance model, the causal-mechanical model, the unificationist model, and pragmatic theories that hold an explanation is simply whatever a community will accept as an adequate answer to a given question. This plurality underscores that no single formal structure has yet captured the full range of what we do when we explain.

When Explaining Is Not Justifying

A subtle but consequential distinction separates explanation from justification. Justification concerns why a belief is true or how one knows what one knows; it is an account of the warrant behind a claim. Explanation, by contrast, addresses why a fact obtains or what brought it about. One can offer a detailed, coherent, and entirely believable account of a phenomenon without supplying a single piece of proof for any underlying belief. In other words, a person may narrate a situation in rich causal detail while providing no justification whatsoever for the premises on which that narrative rests. Recognizing this gap is essential for clear thinking: a vivid causal story is not the same thing as a demonstration that the story's assumptions are correct. Confusing the two modes leads to the error of treating persuasive storytelling as though it were logical proof, a mistake that pervades everyday discourse, legal reasoning, and even some scientific commentary. Awareness of the distinction helps listeners evaluate whether they are being shown why something happened or being shown that something is the case.