Wouldn't it be useful to know what events have happened on a worksheet? In comes History! Check the History tab to see a log of the events that have taken place on a worksheet, outlining the action performed, who performed it, and when.
The history logs the following actions:
Change of status
Change of values
Change of details
Exclude/include worksheets
Added/modified/deleted entry
Attached/detached a file from an entry
Checklist resolved/unresolved
Checklist marked as applicable/not applicable
Journal created, updated, voided
Once an action occurs, it will be immediately logged in the history.