If you are a Microsoft Word user, you may already be familiar with what is meant by the term revision tracking. If not, then you are in for a treat. In a nutshell, Excel allows you to keep track of the changes made to your workbook. Thus, you can see what has been added, deleted, or simply changed.
Revision tracking is normally meant for use in a shared environment, so you can track how other people may have changed a workbook for which you are responsible. However, it can also be a valuable tool even if you are the only one using a workbook. It can be used so you can see your own changes over time.
Revision marking is turned on or off on a per-workbook basis. Thus, if you have two workbooks open at the same time, revision marking can be turned on in either, both, or none of the workbooks. You control revision marking by displaying the Review tab of the ribbon and clicking the Track Changes tool. This displays a submenu from which you should choose Highlight Changes. Excel displays the Highlight Changes dialog box. (See Figure 1.)
Figure 1. The Highlight Changes dialog box.
To turn on revision marking, simply select the check box at the top of the dialog box. If you later want to turn off revision marking, you can display this dialog box again and clear the check box.
With revision marking turned on, you can specify how you want this tool to be used by Excel. The three check boxes in the middle of the dialog box allow you to specify which changes should be highlighted, and the check boxes at the bottom of the dialog box indicate how the highlights appear. The center check boxes (When, Who, and Where) have more to do with resolving revisions, as discussed in a later tip.
At the least, you will want to make sure that the Highlight Changes On Screen check box is selected. This causes your workbook edits to be visible.