 SDRT includes the following components: (i) the semantics of sentences alone, that is the underspecified output of the syntactic processing of the sentences; (ii) the semantics of information content, that is, further addition to these underdetermined meanings, including default additions summarised by rhetorical structure rules; and (iii) the semantics of information packaging that ‘glues’ such enriched representations by means of the rules of the rhetorical structure of discourse. This ‘gluing together’ is defeasible, in that the rules result in the dependency A&gt;B, that is ‘if A, then normally B’, where A and B stand for the enriched propositional representations of two sentences. In other words, they stand for the meanings of two consecutive utterances.