Visualization tools, and systems and software underlying such tools, for allowing user to visualize organizations of people. Members of an organization are represented by unabstracted nodes. In some embodiments, visualization diagrams are efficiently created by abstracting the unabstracted nodes in a manner that reduces the number of nodes needing to be rendered, while retaining the visual character of a similar diagram composed of the original, unabstracted nodes. In these embodiments, regions of abstraction diagrams can be selectively de-abstracted in response to a user's selection within the abstraction diagram. In response to such a selection, in some instances only a particular hierarchical reporting chain within the organization, or a portion thereof, is de-abstracted to allow the user to view unabstracted nodes within that chain. Also disclosed are other visualization tools, such as attribute-overlay tools, time-scrubbing tools, and geographic distribution tools, among others.
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