I don't know where the idea came from (maybe here?) but in an effort to focus on the positive instead of the negative, all of the primary ed teachers at my school have adopted green penning. Instead of marking the wrong answers on a sheet (usually in red) we are now supposed to star the correct answers with a green pen. Then, we score the number correct out of the number possible (+x correct/y possible.) Is this something that is catching on everywhere? I like the idea behind this, but I've never worked at a school where it's policy.