by signalling a possible volitional result relation. Text spans linked by rhetorical relations may consist of single or multiple sentences, potentially leading to a recursive (though not necessarily strictly nested) structure. Rhetorical relations can serve communicative goals such as concept comprehension (e.g., via elaboration of a definition), belief (via presentation of evidence), or causal understanding (e.g., via a volitional result relation, as in (6.1)), and in this way tighten the connection between content planning and communicative goals.