This version of a driver diagram interactively selects a variable for which upstream causes are drawn. github 
The script is hard coded with a starting title present in the .mdl file hard coded in parse.js.
A WASM version of Graphviz draws the diagram as SVG from generated dot syntax. Javascript handles clicks to repeat with a new root.
We've created diagrams from a vensim model that might have additional utility if made interactive.
We explore what leads to Student Achievement. expand
We have versions of this script that show all variables related by their causes. expand
I noticed that the Woodcrest Vensim model was partially plain text describing variables and their dependencies. I wondered if graphviz could find a respectable layout knowing full well that handcrafted layout would be better.