Tarx, in reference to
"Do you keep copies of screen prints say before and after the change?"
I do exactly this. I have an Excel spreadsheet with the change requested, the impact it has, who requested it, when it was completed. I take a screen shot (I use .mdi but .pdf will work too) of the before and after, put it into one file, and then provide a link to it from within the spreadsheet. That way I can search for changes referencing VDNs, vectors, cors, whatever in the spreadsheet and then quickly find the screen prints.