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In many cases, immigration petitions and applications require applicants to reveal biographical information about themselves so that the USCIS can evaluate the eligibility of these applicants to enter or live in the US. Biographic information — including details about education, family, past residences, and other related information -- takes up more space than many immigration forms allow, which is why the USCIS uses form G-325. Whenever you fill out an immigration form or petition requesting biographic information, you may be instructed to file G-325 along with that form. USCIS Form G-325 is never filed by itself, but always as part of another form which requires you to complete G-325 as well.