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Procurement /Purchasing and Supply theory is generally defined a set
of assumptions, propositions, or accepted facts that attempts to
provide a plausible or rational explanation of cause-and-effect
(causal) relationships among a group of observed Procurement/
Purchasing and Supply phenomenon. They are mental models of the
perceived reality or a set of general principles that underlie and
provide a holistic view of the subject matter of Purchasing and
Supply, as distinguished from the methods of the practice .