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For a Cornwall applicant, TN analysis starts with the proposed professional work, not with a preference for a quick border process. The applicant must be Canadian or Mexican, have a prearranged professional engagement in an occupation listed by the USMCA, and satisfy the occupation's prescribed qualifications. A Canadian may request TN classification from CBP during inspection or the employer may pursue an I-129 path. Neither method repairs an unsuitable role, missing credential, or prohibited self-directed arrangement. The initial review should identify the legal employer, supervisor, professional duties, anticipated temporary period, and any third-party customer arrangement. That makes it possible to test the position against the occupation entry rather than its marketing title. It also exposes facts that require a different route: a desire to run an enterprise personally, an unsupported job description, or credentials that do not match the stated profession. The choice of procedure follows the evidence; it should not determine what the employment relationship is called. Before relying on a travel date, confirm that the final letter, credentials, licence position, and entity information describe the same engagement. A changed client, altered duties, or new ownership fact can matter more than a previously prepared cover explanation. Keep the temporary professional proposal factual and internally consistent from start to finish. A first review should produce a duty-to-credential comparison, an employer-control map, and a procedure decision. It should identify whether classification will be requested during inspection or pursued by petition, while recognizing that streamlined travel processing never waives the substantive professional test. Confirm that no proposed activity is self-directed enterprise work. Hypothetical example: an audiologist accepts a clinic's salaried role but retains voting control over the clinic's U.S. operator. The deciding evidence is who holds employment authority and whether the arrangement is employee service rather than self-directed work.