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Soundness of Deductive Arguments in Critical Thinking

Soundness is a technical property of deductive arguments requiring both that the argument be valid (impossible for premises to be true and conclusion false) and that all its premises be true; an argument failing either requirement is unsound. Because a valid argument with all-true premises cannot have a false conclusion, soundness guarantees the truth of the conclusion, making it a central evaluative concept in the philosophy of logic and critical thinking, building directly on the concept of validity.