This is what I do, not really uncommon from what anyone else might do who is into the zone system way of doing things......I used to take notes in the field, but came to not wanting to fuss with writing while in the field. I find it far easier now to just use a digital voice recorder to document the notes, then, usually in the truck before leaving, I'll quickly put them on a card like this. It takes practically no time to do........I find that notes not only help diagnose problems but they also reinforce what went right on those occasions too.