Edit: For user interfaces I often used to make movie-type storyboards, sketched out by hand for people to consider, critique, draw and write over.
We think in similar ways. I've used storyboards and flow diagrams on the conference room whiteboard to do exactly that; consider, critique, communicate, draw and write over.
I wonder how applicable a storyboard would be for smooth music-creation workflows using BiaB.
I'm guessing more than one would be needed to address the different ways BiaB is used.