IN THIS GUIDE · Document specialized knowledge that a referral cannot establish on its own
Start with the L-1B eligibility and application overview
Describe the knowledge the referral is actually based on
Hypothetical example: a Selkirk-based technician is recommended for a U.S. assignment by a manager who worked with them on a specific process. Ask that manager to describe the actual process and the technician's role in it, rather than accepting a general endorsement of the person's ability. Assess special knowledge of the organization’s products, services or other interests and their international application, or advanced knowledge of its processes and procedures. Neither uniqueness nor a proprietary label is a universal standalone requirement.
Assemble the training and project record independently
Gather the technician's own training history and project documentation rather than relying solely on the referring manager's account. The manager's recommendation can point to which projects are relevant, but the underlying records need to be collected and reviewed directly.
Confirm the proposed assignment in writing
Set out what the employee will actually do in the U.S. role and how the claimed knowledge will be used, including whether the work will occur at a client site. A referral that assumes the assignment is well understood should still be reduced to a specific written description before the filing is prepared. For work primarily at an unaffiliated employer’s site, assess both statutory bars: being controlled and supervised principally by that employer, or essentially providing labor for hire rather than a product or service requiring knowledge specific to the petitioning employer. Document actual control, supervision and the petitioner-specific knowledge connection.
Verify the corporate relationship and employment history directly
Confirm the qualifying employment abroad and the corporate relationship between the entities with actual records, rather than relying on the referring manager's understanding of how the companies are connected. A close working relationship between teams does not establish the documented corporate relationship the category requires. Generally establish one continuous full-time qualifying foreign year within the relevant preceding three years. Brief U.S. visits need not break continuity, but U.S. days do not count toward that year. The qualifying organization must conduct regular, systematic, continuous business in the United States and another country. A U.S. operation doing business for less than one year is a new office: show sufficient premises and financial ability to pay the employee and commence business; initial approval is limited to one year. For an ordinary L petition, the qualifying foreign work may be managerial, executive or specialized knowledge; the U.S. duties must meet the requested classification. New-office L-1A specifically requires managerial or executive foreign employment.
Sort general skill from company-specific knowledge
The knowledge need not universally be unique or secret, but general occupational skill alone is insufficient. Placement primarily at an unaffiliated employer’s workplace raises specific restrictions concerning who supervises the work and whether the arrangement amounts to labour for hire. Explain its special or advanced character with genuine training and project evidence instead of claiming nobody else could ever learn it. If any work will be performed at a customer's facility, confirm that the petitioner retains control and supervision and that the work is not labour for hire; placing the specialist inside a retailer's warehouse under the retailer's direction is the arrangement the statute prohibits. Acquisition does not automatically make knowledge specialized, but externally obtained methods are not universally disqualified either. Begin with the system, process, product configuration, or internal method rather than with flattering labels for the employee.
Sources reviewed 2026-09-07. This guide covers a preparation focus; it is not an individual eligibility assessment.