<p>I know this may be a really stupid question, but I'm going to ask it anyway. I've already sent in my accept offer to UCLA, but do I have to send in a declining SIR to all the other schools? I know I probably should to my private schools, but what about the other UCs?</p>
<p>Not necessary.</p>
<p>It is nice to let the others schools know you decline their offers. Just common courtesy. I believe some may ask you which school you end up going to -- for statistics and some other research purposes... ;-)</p>