] Most documents are the product of continual
] evolution. An essay may undergo dozens of revisions;
] source code for a computer program may undergo
] thousands. And as online collaboration becomes
] increasingly common, we see more and more
] ever-evolving group-authored texts. This site is a
] preliminary report on a simple visual technique, history
] flow, that provides a clear view of complex
] records of contributions and collaboration.

IBM | History Flow