If the application requires you to attach copies of important documents, make good clear copies. Off-centered, too small (do not try to put all on one page), and out of focused copies may be rejected. Make sure you also write on any addendum papers your name, just in case they get jumbled.
Hint: If you are making several applications, take time, go to the copy store and make several copies of each important document. The most requested ones will be on hand for later applications. It saves you time and frustration.
Good Order or Good Riddance
If you have to prepare a packet, put it in order. The cover letter should be on the top, followed by the agency application. Follow with the copies in order of their request. If you do add a résumé, announce on the cover letter that it is attached.
The big secret on applications is two-fold. One, you want to make this process as easy as you can for those who process it. If they cannot read it, it is incomplete, or it is just so horrible to deal with, you are catching a ride on the rejection train.