I was so happy to have found this old video of Kurt Vonnegut. Apparently it's been out there for a long time, but if you've never seen the arc of a story described with the graphs of this Washington Post article that includes the video, you might find this link useful. washingtonpost [dot] com
You're welcome, J-R. I want to view the whole video which I noticed is on yutube. Didn't get a chance yet. I love the way this article related specific arcs to classic stories. A screen writer once was working on a treatment from a short story I wrote and was having trouble with the arc. I think I'm finally getting that concept!