Describe the actual tasks, relevant expertise, employer relationship and supervision.
Make the scope understandable
A timetable alone does not show specialized knowledge or the actual offsite arrangement. Do not fill the short schedule with duties the employer does not propose simply to strengthen the description.
Draft the assignment description around tasks, specialized knowledge, control, location, and deliverables, not merely arrival and departure dates. Support company-specific expertise with training histories, versioned manuals, project records, and comparisons showing why the knowledge is special or advanced. Foreign payroll and employment records must separately establish one continuous qualifying year within the prior three, while corporate documents prove an active parent, branch, subsidiary, or affiliate. At a third-party site, contracts and supervision plans should show that the petitioner controls the work and is not supplying labour. Add previous L time to test the five-year L-1B ceiling. A typical mistake is letting a customer-written schedule describe who directs the employee.
Hypothetical example: an Orford ski-binding calibration specialist is assigned to configure an affiliate's new testing bench for twelve days. The letter should identify the proprietary calibration sequence, equipment versions, decisions she alone will make, remote supervisor, and final validation record. Her training log demonstrates knowledge but not the qualifying foreign year; payroll and travel evidence perform that job. If an outside retailer dictates her daily work, the services agreement should be reviewed before filing rather than hidden behind a short itinerary.