When you apply for U.S. citizenship (apply for naturalization), you must meet certain eligibility criteria, and you must pass an examination and attend an interview with an officer from U.S. Citizenship and Immigration Services (USCIS). This interview serves several purposes, as it allows the officer to go over all the information on your citizenship application, test your U.S. knowledge and English skills, and generally make a decision regarding your eligibility for citizenship. Expect the officer to review the substance of your application during the interview.