The present activity and authorization need assessment.
Describe the changes before relying on the file
Record actual employer, duties and proposed dates. A prior decision is not automatically permission for materially different work or a new start period.
Once the U.S. firm's letter is final and the regulator's standing letter is in hand, the surveyor can present the package at a land or airport port of entry and, if admitted, start on the agreed date. Ask what changed on the effective date: only a human-resources band, or also the employer, core functions, worksite, compensation, ownership or duration. Make a dated sequence covering the offer, planned admission or I-129 route, authorization point, travel, and any proposed first day of work. Create a dated authorization plan showing the earliest document-ready date, requested classification step, admission or petition decision, first paid duty and any later project change. Combine that with the point at which work may lawfully begin, which is set by the authorization steps rather than by the employer's calendar.