Into what two categories do Perelman and Olbrechts-Tyteca divide the starting points of argumentation? What specific sources of agreement are placed under each heading?

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The Answer is Perelman and Olbrechts-Tyteca divide their starting points of argumentation into "the real" and "the preferable." The first category is found in what both speaker and audience accept as well-established facts, widely accepted truths, or uncontested presumptions. The second category of "the preferable" consists of commonly held values, and value hierarchies. This concept connects with Aristotle's notion of endoxa.

Into What Two Categories Do Perelman and Olbrechts-Tyteca Divide the Starting