Viewing work item history
After workflow events are added to an item, you can view the estimated, actual, and remaining work for the item, and the variance between the estimated and actual hours. This can help you determine how much effort is required to complete an item.
1. Click the Workflow tab and click Work Items when you are viewing or editing an item.
Events that include time tracking information are displayed.
2.
Click 
to view details for all the events or 
to collapse all expanded events.
You may also be able to modify event details or delete events when editing items. See Editing and deleting workflow events on items.