USCIS is issuing policy guidance in the USCIS Policy Manual to clarify how USCIS evaluates evidence to determine eligibility for O-1A nonimmigrants of extraordinary ability, with a focus on persons in science, technology, engineering, or mathematics (STEM) fields, as well as how USCIS determines whether an O-1 beneficiary’s prospective work is within the beneficiary’s area of extraordinary ability or achievement.