If I understand it correctly, don't like Bernard's plan for fingering A at all, it's too cramped. I also disagree with his "a guitarist never lifts..." and say the opposite..you only lower your fingers when necessary." I do like the classical thumb, though.

John McKenzie, I know what you're talking about, but next time say " little finger holding down the top E *string* on the 5th fret," because the "e" pitch on the 5th fret is played on the B string, and, at least for anyone who has bothered to learn the notes, your description is paradoxical.