One point I have not seen in the literature about arguments is the distinction between "What?" questions and "Why?" questions.
A what-question asks for information. But a why-question asks for a reason or sequence of reasons that lead to a conclusion or an explanation.
Terry Winograd's SHRDLU system from the early '70s could answer why-questions by tracing backwards through the its theorem prover. But documents written by and for humans (other than mathematicians or medieval Scholastics) are rarely derived by a theorem prover.
Has anyone been addressing the what/why distinction?