I've added an "initial here" box next to each line item on the contract. As soon as I added it, renters inherently figured out that they needed to fax back all pages.
It of course also provides greater documentation when someone says they didn't understand part of a contract - if they initialed by each line, their argument is significantly weaker.
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My contract has 4 pages-- not full pages-but each page deals with it's own issue ( 1st is all personal info, billing, authorization to billl credit card, etc .2nd is Deposit info and terms, 3rd is Terms of Rental & Cancellation Policy, 4th is Hold Harmless).
Each page is numbered under the signature line- 1 of 4, 2 of 4, etc. If I don't get ALL of them back, signed and dated, I reserve the right to cancel the reservation. And, yes, I have done just that , though only once. If I have their signature, it is a legal, binding contract.
I've thought about the line by line initials thing- just haven't taken the time to rewrite the contract.