So I think we've all faced utter annoyance at this stage of planning. Some advice to you gals when sending yours out! Feel free to add to my list!
1) Have multiple RSVP options. This maximizes return rates.
2) Decide early on if you will accept phone/text RSVPs
3) NUMBER/Code each RSVP card!!! I recieved many where people just tore off the card and sent it back without filling in their names. We wrote each persons last name on the back of the card really tiny. Thank goodness for that
4) Make it clear how many people are invited and be prepared for ppl to ignore that
5) A lot of ppl did not check accept or decline so we had to call them
6) decide on your plus one policy and stick to your guns