Difficulty alone is not the full standard. Explain the actual company knowledge used and why it is relevant to the US work.
Describe the reasoning behind the result
A successful resolution can be useful evidence without proving every requirement. Avoid substituting praise such as “indispensable” for a concrete account of expertise.
The statute defines specialized knowledge as special knowledge of the petitioning organization's product, service, research, equipment, techniques, management or other interests and its application in international markets, or an advanced level of knowledge of the organization's processes and procedures. Knowledge of the employer's own product and how it is configured, commissioned and supported is the type of knowledge L-1B contemplates, provided it is genuinely distinct from what others in the industry hold and the worker has one continuous qualifying year with the company abroad. L-1B still requires a qualifying corporate relationship, one continuous foreign-employment year within the preceding three, and special or advanced knowledge of company products, processes, or procedures rather than ordinary skill. The applicant must have been employed continuously for one year within the three preceding years by a qualifying entity abroad, in a managerial, executive or specialized knowledge capacity, and the United States role relied on specialized knowledge as defined. General technical skill, a hard-to-fill position, or an unsupported claim of being irreplaceable does not by itself establish the category, and the qualifying company relationship and foreign employment remain separate conditions that also need to be met.