Visualizing Communication Timelines using Sparsely Distributed Clusters
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Communication methods: chat, e-mail, video, shared notebooks.

Event attributes: sender, receiver, time (sent/received), media type, content.

Data is sparsely distributed over time.  Need powerful zoom, but want
to keep context.

Features
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Overview + detail, participant graph, multiple foci, automatic
management of foci, hierarchical foci.

Three Levels of Detail
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Overview: just timeline

Intermediate: sending graph

Detail: content

Hierarchical zoom: selecting a part of any timeline opens a sub-window
with the zoomed-in timeline.