While at the University of California, Santa Cruz, Toulmin published Human Understanding: The Collective Use and Evolution of Concepts (1972), which examines the causes and the processes of conceptual change.
Under den tid han var verksam vid University of California, Santa Cruz gav Toulmin ut Human Understanding: The Collective Use and Evolution of Concepts (1972), vilken utreder orsaker och processer bakom begreppsliga omvändelser.