(8.15.X) Track changes related to the field values
Every project will save its history. This will show the project administrator what has been changed in that project, when, and what was the original value. Just by clicking on the history button on the top-right corner in every project, you'll see that information.
In the result you will see:
Date of change
The user who made the change
The field that was changed
Original value
New value