Slide 1
Reasoning toward an explanation
Abduction infers a proposed explanation from evidence. It asks what would make the observations intelligible, rather than merely listing a pattern.
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Imagine finding wet footprints beside an open umbrella. A recent arrival from rain is one candidate explanation. The clues initiate a hypothesis; they do not independently certify its truth.
Slide 2
Compare real alternatives
An explanation becomes stronger when it handles the evidence better than plausible rivals. Considering only one story makes comparison too easy.
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Someone might have washed the floor or brought in a wet umbrella from storage. Looking for the direction of the footprints could distinguish these possibilities. Useful hypotheses suggest further observations to make.
Slide 3
Best does not mean certain
The best explanation among those considered may still be wrong. An overlooked alternative can outperform every option on the original list.
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A competition cannot select an entrant who was never admitted. This simple analogy identifies a limitation in inference to the best explanation: the quality of the conclusion also depends on the search for candidates.
Slide 4
What counts as better
Explanatory breadth, coherence and simplicity can matter in comparison. Philosophers debate how these virtues connect an explanation with truth.
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A story can cover many clues by adding a separate convenient assumption for each one. Counting explained observations alone misses this cost. The argument needs to show how its assumptions actually connect the evidence.
Slide 5
Use explanations to investigate
A promising explanation should guide further inquiry. Evidence that separates rival accounts is more useful than another detail compatible with all of them.
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Returning to the umbrella, a dry street would change the comparison without making every rainy-arrival story impossible. Abduction is a revisable route through evidence, and its strength can change as the inquiry grows.
Sources
- Abduction
Stanford Encyclopedia of Philosophy