Where they come into their own, is let's say that you wanted to phone me in July because my wedding anniversary is in July, you could turn to the back of the July calendar card, write down call Ricky Elliot on the seventh, because it's his wedding anniversary, erm, and write down my, my telephone number and then distressing though I find this idea, you could forget the whole thing, confident in the knowledge that the system will remind you at the appropriate time as to what action you should take.