A qualifying relationship, one continuous year of qualifying employment abroad in the previous three years, and a U.S. position requiring specialized knowledge of the company's own process rather than general professional skill.
Two findings, not one
Specialized knowledge is knowledge of the petitioning organization's product, service, research, equipment, techniques, management or procedures, or an advanced level of knowledge of its processes. A validated internal protocol with its own data behind it is the kind of thing that fits; a widely held laboratory accreditation is not, however rigorous it was to obtain. The employee must possess the knowledge, and the U.S. position must actually require it, which is a separate question. An assignment described mainly as training staff tends to fail the second, because training is a general skill available on the market. The corporate conditions are the usual ones, with both entities actively doing business and a continuous, full-time qualifying year inside the preceding three years. The category is capped at five years, and earlier U.S. time in an L category generally counts against that cap.
Hypothetical example: a medical-device calibration company proposes to transfer the engineer who created its internal tolerance library for a specialized testing rig. The first review should identify the precise knowledge, its connection to the organization, and the U.S. tasks that cannot be performed without it. Version-controlled technical files, training records, authorship material, and the U.S. work plan settle those points better than a general statement that the engineer is indispensable. Sequence the review by defining the knowledge before writing the job description. The recurring error is describing ordinary engineering competence, or only a plan to train others, without showing why the affiliate needs this individual's company-specific experience. Also confirm the qualifying corporate relationship and full-time foreign employment inside the relevant three-year window; technical strength cannot replace either requirement.