Here is what happened during my wife and child interview at USA consulate in Vietnam:
Husband is petitioner & USC; wife and daughter immigrating from Vietnam.
After waiting….Went to the first heavily glassed window where we provided original birth, marriage cert and divorce documents and police certificate. No other originals or copies were provided despite what they asked for on website prior to interview.
We spoke into a microphone when she asked both of us: What is your address in America? Wife responded Michigan, I responded with exact address.
Asked wife: Have you had problems with police?
Asked wife: How many children have we both had?
Asked wife: How many times have you been divorced?
Ater waiting we went to a Second glass window for the formal interview by two interviewers. Speaking into microphone.
Asked wife: Where did we meet? And when?
Asked wife: How many times divorced?
Asked wife: How many times I (husband) go and come to Vietnam?
Ask wife: What’s his (husband) job?
Ask wife: Was your (husband’s) first wife from Vietnam or different country?
Asked both of us separately in different languages: Where does he/you (husband) live now?
Interviewer Paused….And then stated Congratulations your approved.
Note: total time approximately 5 hours. Visas arrived 5 days later. I hope this helps.