The USCIS (formerly the INS) is the authority and government agency that processes the immigration forms. They are authorized to approve or reject the form. What USCIS application form you use depends on your circumstances. All forms are available on the USCIS website.http://www.immigrationdirect.com/uscis-forms/uscis-forms.jsp » http://www.immigrationdirect.com/articles/the-uscis-application-form/index.html »