Tree-style hierarchy is type of a method and system is provided for generating a tree-style graphical representation that depicts simultaneously hierarchical and non-hierarchical interrelationships among a set of entities. There is two sets of specifications are acquired. One set describes a set of hierarchical interrelationships. The other set describes a set of non-hierarchical interrelationships among the same set of entities. Based on the two sets of specifications,The generated tree-style graphical representation is displayed, as a graphical user interface, on a display device.