IN THIS GUIDE · Explaining scientific knowledge, practical skills and direct professional support
Start with the TN eligibility and application overview
Identify the qualifying discipline
The named fields are agricultural sciences, astronomy, biology, chemistry, engineering, forestry, geology, geophysics, meteorology and physics. Identify the actual discipline involved rather than describing the role as generally technical. Do not extend the list by analogy to any job that uses equipment or software. The first decision is whether the discipline can be named precisely; the employer letter and project description should use the same discipline rather than alternate technical labels.
Explain the theoretical knowledge
Describe the scientific principles the person must understand and provide evidence of the preparation supporting that knowledge. Match records to the work rather than treating an equipment certificate as complete proof. The entry should be read on its own terms, without importing a universal bachelor’s-degree requirement from another profession. A transcript, course descriptions and employment records may resolve whether the claimed knowledge is personal, while an unsupported title generally does not.
Show practical application
Explain how the person solves practical problems in the discipline or applies its principles to basic or applied research. Use factual tasks and outputs rather than broad claims of technical competence. Routine procedures should be described honestly so the reviewer can assess whether the actual work meets the criterion. The reviewer should be able to trace one task from the scientific question through the method and resulting output. That sequence is more useful than an inventory of instruments.
Describe direct support of professionals
Identify the professionals supported, their discipline and how the technician’s work feeds into theirs. An organisational chart can help explain that relationship. Do not replace the direct-support criterion with an invented rule requiring constant observation, a particular supervisor title or a fixed daily sign-off routine. A Canadian applicant may request admission at border inspection or preclearance, and an employer can submit Form I-129 to USCIS. TN cannot be used for work for a U.S. enterprise the applicant controls or owns outright.
Keep translation separate from credential evaluation
TN turns on the credential alternatives written into the specific profession's listing, not on a general notion of equivalency, so counsel should confirm which alternative the applicant is relying on before anything is drafted. Some institutions will reissue a diploma or transcript under an updated legal name, while others will only provide a letter confirming that the record belongs to the person now using a different name. TN is temporary USMCA-listed professional activity for Canadian or Mexican citizens; Canadian permanent residence is insufficient. Where the credential was issued by an institution outside Canada, Mexico or the United States, the regulation calls for a reliable foreign-credential evaluation, which is a separate document and not a translation. A first file review can turn the offer, credentials, and citizenship proof into a one-page issue list: which duties are professional, which qualification is required, whether a licence is relevant, and which document settles each point.
Sources reviewed 2026-09-07. This guide covers a preparation focus; it is not an individual eligibility assessment.