Chapter 1 - Purpose and Background
Before becoming a U.S. citizen, an eligible naturalization applicant must take an oath of renunciation and allegiance (Oath of Allegiance) in a public ceremony.  The applicant must establish that it is his or her intention, in good faith, to assume and discharge the obligations of the Oath of Allegiance.  The applicant must also establish that his or her attitude toward the Constitution and laws of the United States makes the applicant capable of fulfilling the obligations of the oath. 
During the naturalization interview, the applicant signs the naturalization application to acknowledge his or her willingness and ability to take the Oath of Allegiance and to accept certain obligations of United States citizenship. Under certain circumstances, an applicant may qualify for a modification or waiver of the oath.  In such cases, an officer draws a line through the designated modified portions of the oath and the applicant is not required to recite the deleted portions. 
Applicants must generally recite the Oath of Allegiance orally during a public ceremony. Merely signing the naturalization application and a copy of the oath does not make the applicant a U.S. citizen.
Pub. L. 106-448 (PDF) – Waiver of Oath of Renunciation and Allegiance for Naturalization of Aliens having Certain Disabilities Act of 2000
No appendices available at this time.
Technical Update - Replacing the Term “Foreign National”October 08, 2019
This technical update replaces all instances of the term “foreign national” with “alien” throughout the Policy Manual as used to refer to a person who meets the definition provided in INA 101(a)(3) [“any person not a citizen or national of the United States”].
POLICY ALERT - Comprehensive Citizenship and Naturalization Policy GuidanceJanuary 07, 2013
USCIS is issuing updated and comprehensive citizenship and naturalization policy guidance in the new USCIS Policy Manual.