Is there a way to track changes made to the contact record so a user can tell if a field value has been changed to a different value and who by?
Any time this field data is changed, the system will automatically create a line item on the history tab that gives the date, time, user and reference to what was changed (see below):
1. Right click on the field you wish to track changes for
2. Choose Properties
3. On the security tab, choose the check box at the bottom to "Log the changes in History"