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In this article we introduce the basics for understanding the mechanisms of Argument Theory Change. In particular we reify it using Defeasible Logic Programming. In this formalism, knowledge bases are represented through defeasible logic programs. The main change operation we define over a defeasible logic program is a special kind of revision that inserts a new argument and then modifies the resulting program seeking for the argument's warrant. Since the notion of argument refers to a set ofdoi:10.4114/ia.v12i40.979 fatcat:fmv2xtcapzdh5naj3qhgzds5vi