The definition provides alternative bases. Have the actual special or advanced knowledge assessed under the relevant standard rather than assuming every applicant must establish both descriptions.
Choose the explanation supported by the facts
Explain the actual knowledge and proposed application with sufficient evidence. Merely repeating the language of the definition does not establish eligibility, and an ordinary skill does not qualify because it is relabelled.
The knowledge has to attach to the petitioning company — its own product, service, research, equipment, techniques or procedures, and how those apply in international markets — or be an advanced level of knowledge of that organization’s processes. USCIS evaluates specialized knowledge by asking whether the knowledge is of the petitioner’s product or processes and whether it is distinct or advanced relative to others in the company or the field. Break the proposed expertise into two layers: what the published industry standard teaches and what the employer’s own product, process, exceptions, or international application requires. USCIS assesses the totality of the evidence; the knowledge need not be proprietary or unique, and U.S. labour-market unavailability is not required. L-1B requires special knowledge of company products or advanced knowledge of company processes, plus one continuous qualifying foreign employment year in the preceding three and an active qualifying corporate relationship.