In data processing device incorporating a processor and memory in communication with the processor, the memory includes executable instructions that, when executed by the processor, cause the data processing device to perform: receiving an attribute metric of a first node with respect to a plurality of second nodes; generating, based on the received attribute metric, a pool of the second nodes that have been in a relationship with the first node; ranking, based on the received attribute metric, the second nodes in the generated pool; dynamically grouping the second nodes to sequentially create one or more level groups; and displaying, on a display, the level groups in a visually differentiated manner reflecting a relative attribute metric of each level group. The device thus presents a display of level groups that is neither cluttered nor sparse.