Twproject collects project’s data to create complete statistics about time elapsed, work estimated and done, cost incurred, open phases and ToDo.
Every time something changed in your project, in fact, Twproject take a snapshot about all data so that you can see how things changed in time, which was your first estimation, when worklog has been inserted.
At the top of the page you will find a slider:
This slider lets you move in time to see how your project data was on certain date.
Statistics page will show detail about worklog inserted in time and costs.