The tree diagram for our example uncovers more than 75 whys (causes and contributing factors), each of which is a potential target for action to reduce the risk of a recurrence.

Java Power Voronoi Diagram Power Voronoi Diagram is a fast standalone java (minimum 1.6) library which computes a weighted Voronoi Diagram, called Power diagram.

If PHYLIP isn't available, we use standard hierarchical clustering methods as an alternative. Result: We produce visual tree diagrams (both circular and rectangular), as well as data files (.nwk and ...