For individuals in the process of becoming citizens of the United States, who have already submitted Form N-400 and completed the fingerprinting and background check requirement, the interview with the United States Citizenship and Immigration Services (USCIS) is an important step forward. Once the preliminary verification of eligibility and the background check has been completed, the USCIS schedules the applicant for citizenship an appointment for an interview. Applicants receive a notice by mail which details the time, date and location of the interview as well as any requests for additional documentation that may be necessary in order to demonstrate eligibility as a U.S. Citizen. The following documents are always required at the interview: the applicant's Green Card, or Permanent Resident or Alien Registration Card; the applicant's passport; the applicant's State-issued identification card; and any re-entry permits that the applicant may have for travel to and from the U.S. USCIS also strongly recommends that applicants bring two passport-style photographs to the interview. At the interview applicants are questioned on their backgrounds and desire to attain citizenship. The interviewer will ask for evidence supporting the application, about where the applicant has resided in the U.S. and about the applicant's character, his attachment to the U.S. Constitution and his willingness to take the Oath of Allegiance to the United States. Additionally, at the interview USCIS tests the applicant's ability to read, write and speak English as well as the applicant's knowledge of U.S. civics. In some cases decisions are received the same day as the interview and applicants may take the Oath, immediately becoming U.S. Citizens. In other cases, depending on the jurisdiction, decisions are delayed and applicants are notified by mail regarding the outcome of their interviews and tests.