Deliberatly Meaningless Index.
the only thing it CAN be usefull for is to see if the training happened.
(if you write down the DMI for a player, and then check to see if training happened, you will notice if the number has changed or not. If not, training didn't happen yet...)
It's prety useless for anything else
Well sublevels of gameshape could be traced
a bit by DMI. But I think nobody does this (notice your DMI can be lower after training because of the change in game shape sublevels).