Jacob
What goes around comes around.
Well yes definitely for faces but I always do board edges in the vice. I guess I'm a bit of a slacker.True, but if you plane wood on a bench without strapping it down, it speaks back and tells you what's wrong with it by skating around in a particular way.
Another little trick is to take a look at the shavings as they come up through the mouth and you can see which part of the workpiece you are removing them from.