What's the difference? Is there a link?
"Was it over when the Germans bombed Pearl Harbor?"
I take it that you are asking this because you see in the Recipes Partial, Multiple, All Grain.
Partial - a partial mash
Multiple - recipe is given in All Grain and Extract
All Grain - simply the All Grain recipe
Here is a link that teaches the different methods of mashing. I hope this helpshttp://www.homebrewtalk.com/f36/all-...torials-78963/