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The Place of Reason in Ethics
Doctorial essay. He stated conduct is justified if the actor has good reason. This was the basis for all of his future works.
https://www.encyclopedia.com/history/encyclopedias-almanacs-transcripts-and-maps/stephen-edelston-toulmin -
The Uses of Argument
He found six components to arguments, very similar to scientific method. They are claim(statement), data (backing for claim), warrant (link of claim and data), backing (support for warrant), modality (degree of certainty), and rebuttal (exceptions to claim).
https://www.thoughtco.com/toulmin-model-argument-1692474#:~:text=The%20Toulmin%20model%20%28or%20system%29%20is%20a%20six-part,and%20categorizing%20arguments.%20Purpose%20of%20the%20Toulmin%20Model -
Human Understanding Volume 1
This writing speaks that rationality is only fully demonstrated in "compact disciplines" such as math, natural sciences, medicine, law, and technology.
https://www.jstor.org/stable/40236945?seq=1 -
The Abuse of Casuistry
Written with Jonsen. This states that there is a clear moral paradigm. It also states that reason moves forward when confronted with difficult cases. This is the same basic approach that science takes when it evolves or when a paradigm shift occurs.
http://caae.phil.cmu.edu/Cavalier/Forum/euthanasia/background/Toulmin.html