Build the strongest case you possibly can. Give them no choice but to approve the petition. The packet I submitted to petition my fiancee was 110 pages. Photos (put in a Word document and printed out with dates and descriptions), airline tickets / boarding passes, passport stamps, hotel receipts, engagement ring receipt, letters from her mama and sister attesting to our relationship, receipts for gifts I sent her when we were LDR, etc. BTW... we still got an RFE but that was because I did not read the instructions carefully enough. If you (the petitioner) has had any kind of negative interaction with law enforcement (Arrest, conviction, etc.), anything other than minor traffic tickets, make sure you detail it in the application AND include ORIGINAL, CERTIFIED police reports, court records or whatever is appropriate. I only detailed in the petition what happened to me when I was a dumb kid but did not include any official records which cost us a few months in the processing time and caused us to get an RFE.