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All four propositions, assumptions (A), presumptions (P), suppositions (S), and presuppositions (PS), are, in general, part of human language and its usage, usually studied under the domain of linguistics. Critical thinking, as we understand in these volumes, is critical analysis of human language and its linguistics and narratives and arguments, which freely or spontaneously use A, P, S, and PS. These in turn are composed of signs, symbols (e.g., the alphabet) that bear meanings (semantics), messages and information (informatics), and motivation and persuasion via argumentation (pragmatics). We elaborate on these in this appendix.

Our major thesis here is the epistemological quasi necessity of A, P, S, and PS, which we freely and spontaneously use in linguistics, informatics, semantics, semeiotics, and pragmatics in our day-to day discussions, dialog, research, teaching, conversations, and conventional rationalizations. These can be both good from the viewpoint of transparency and honesty, opacity, and human exchange information asymmetry. They are dangerous since such A, P, S, and PS could be based on false dichotomies of man/Nature, male/female, truth/falsehood, objectivity/subjectivity, riches/poverty, equality/inequality, and the like; most of the negative aspects of such dichotomies are being used for self-serving, profit-maximizing, wealth-accumulating, poverty-perpetuating, and socially polarizing purposes. Human Anthropocene history is dotted with them, especially in the developmental context of industrialization and economic infrastructure development.

Hence, the vital necessity of critical thinking for critical self-examination, especially in current MBA curricula. All the three volumes of this book on critical thinking are expressly designed for this purpose.