Discussion trees are a subcategory of idea trees. Discussion trees can help you analyse discussions and see where they fall apart (if that happens) and what questions have been answered and how.
Below is a discussion tree of one discussion that I had with a friend on whether people can change.
You can see the discussion tree in bigger format:
nikluk’ discussion tree – “Can ppl change?”
Elliot Temple (curi) gives feedback and comments on my discussion tree in this stream (timestamped).