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Through the 1960s and 1970s, Putnam helped refine a theory of mind known as functionalism. Mental or psychological states are defined by their roles and are “functional states” of an entity.
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Professor Putnam showcased his argumentative skills with a thoughtful experiment called Twin Earth. This was in his paper titled "The Meaning of Meaning"
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Putnam's critique of the traditional fact-value dichotomy is the distinction between what is factual and what is, or is not, to be norm or value.
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In Putnam's paper, "Why there isn't a ready-made world", Putnam explained his understanding of realism which he called "metaphysical realism".