Historian provides a time stamp of form edits and places the data directly into a table on the form for easy reference to historical changes over the form's lifespan. RPM tracks all form changes in the form history already but the Historian places it directly into a free rows table on the form making it easier to track. The Historian is best used to track specific fields on the form and when they get updated giving insight on when critical information is changed.
Since the historical data is now on a table in form it is possible to pull the data into process views allowing the ability to report on forms with the latest Historian entry.