Inbal Kashtan developed the NVC Tree of Life in 2005. It is a tool that shows in one simple graphic an overview of Nonviolent Communication. In 2012 she wrote a manual for this tool, describing the background and the various possible uses in workshop settings and in private life.
I translated her manual into German, with the collaboration of Sabine Geiger. You find the German translation of Inbal’s manual here.
The graphic picture for this tool is published by BayNVC here.