Interoffice Memorandum: Guidance on the Requirement of a 'Permanent Offer of Employment' for Outstanding Professors and Researchers, Revisions to Adjudicator's Field Manual (AFM) Chapter 22.2(c)(2)(B) (AFM Update AD06-00) [open pdf - 60KB]
"This memorandum provides guidance on applying the definition of 'permanent employment' as set forth in 8 C.F.R. § 204.5(i)(2) when adjudicating first preference (EB-1) petitions filed on behalf of outstanding researchers."
U.S. Citizenship and Immigration Services: http://www.uscis.gov/