We have revision block (1 row x 4 columns) info that shows:
Revision letter (no I, O, or Q)
Revision description (as many lines as needed, including ECO number)
All of the above are text parameters that are attached to the part /
assembly, not the drawing.
The drawing calls out these parameters in the drawing format, and in the
revision balloons automagically.
BTW, if you wanted, you could also callout the individual part revision
levels in an assembly BOM, if desired.
We only show the latest revision, because this makes it clear exactly
what changed from the last revision.
Revision description notes are in the format "* was *" i.e. "2.750 WAS
3.250", or "DETAIL WAS ADDED"
Maybe this could also feed some type of ECO / Change control software
(PDM-Link, Windchill?) we don't use it though.
Just my $0.02...
124 Hidden Valley Road
McMurray, PA 15317