1. Wear formal clothes as if for a formal business meeting. The interviewing officer will always be an American (the interpreter if required may be local). If possible the man should wear a tie. Americans always appreciate formal attire, so they will not find you over-dressed if you wear a tie.
2. Arrive early. You don't want to miss your interview just because you got stuck in traffic.
3. Do not get nervous. Be confident. You will be more confident if you have prepared thoroughly. Smile when you meet the visa officer for the first time. Don't show signs of nervousness such as flickering of eyes, trembling of fingers as that could go against you. Look into the eyes of the officer while speaking.
4. Both candidates should greet the officer with a smile and a "good morning", as soon as you enter the interview booth.
5. Both candidates should have a confident posture and look at the interviewing officer straight in the eyes throughout the interview.
6. Be confident in your answers, whatever you say. Make short, clear, to-the-point replies, in a loud and clear voice. Do not tell anything that is irrelevant or not asked. By mistake, you may give some unnecessary information that may lead to your rejection.
7. Be polite, do not argue and do not ask unnecessary or unrelated questions. Do not unnecessarily elaborate your responses as this may not work in your favor.
8. Demonstrate respect in your language even if you don't feel this is being reciprocated.
9. Often times you might not understand what the interviewing officer is saying because of his/her American accent and/or the microphone system. If you do not understand one of their sentences do not feel afraid to say, 'beg your pardon; I did not understand you.' If he/she repeats the question and you still do not understand, that is not a problem, do not panic. Calmly and confidently say, sorry sir/madam. I still did not understand you. Could you kindly repeat what you said?
10. If you know