What no system of record will ever hold. “Tinto always adds ten euros for postage.” “Black PLA comes from X, seven days' lead time.” “Never chase Hofer before the 10th.” One fact per note, and always the reason behind it — in six months it is the reason that stops you repeating the mistake. Tag a note with a customer, a supplier or a machine, and FRIDAY brings it back on her own the day that subject is on the table.