In the past, if the appointment was at the American Consulate, the packet of papers contained the affidavit of support which was backed up with a letter from the person's employer verifying that they have a job. And a statement from the bank stating how much $ is in the account(s).
Another add-on could be a bonafied job offer for the immigrant.
These things support the expectation that the immigrant will not become a burden on the American government (ie welfare).
The interview has asked typical questions about your daily life together. Does he/she eat Corn Flakes? Who does the grocery shopping? What do you wear/or not to bed? Kind of a Newlywed Game, because they will compare answers. So don't make anything up. If you don't know, say so.
The packet of papers contained everything they requested from the translated, notarized birth certificates, to the birth certificates of any children, and anything else on the list. And translations. Notarized. And often the Notary Commission was verified by the State and the Consul of the immigrant's country.
Originals with two photocopies (if you want the originals back).
Some of these things may have changed, but the basic process is the same.
Good luck.
mkohn
