Abstract
Some solo verbal reasoning serves the function of arriving at a correct answer to a question from information at the reasoner’s disposal. Such reasoning is good if and only if its grounds are justified and adequate, its warrant is justified, and the reasoner is justified in assuming that no defeaters apply. I distinguish seven sources of justified grounds and state the conditions under which each source is trustworthy. Adequate grounds include all good relevant information practically obtainable by the reasoner. The claim must follow from the grounds in accordance with a justified general warrant. If this warrant is not universal, the reasoner must be justified in assuming that no exception-making circumstances hold in the particular case to which it is applied.
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Hitchcock, D. Good Reasoning on the Toulmin Model. Argumentation 19, 373–391 (2005). https://doi.org/10.1007/s10503-005-4422-y
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DOI: https://doi.org/10.1007/s10503-005-4422-y