Thanks too: have printed off a couple of copies for friends who find this difficult. I just do the count-up method myself.

The thing that causes even more grief is the difference between Key and Start note for a song: having done a lot of music theory myself, it comes as second nature to me, but then if it's capo'ed as well, some folk talk about the real key and others in the chord shape key................ Best to try to keep quiet and let them get on with it, as they won't believe me when I tell them the start note is definitely F#: half an hour later..............

Oh and not to mention if you have any transposing instruments in your midst! (A horrible clash when the reed band met the bagpipes once I recall, as one lot were going by the notation and the other the "ear" key)