It may explain relevant work or context, but identify what the author actually knows and which facts the letter supports.
Avoid substituting praise for knowledge evidence
Connect the account to actual duties and company records. A customer may not know the applicant’s full employment history or internal training. Keep those questions supported by appropriate evidence rather than extending the letter beyond its factual basis.
An author listing may not explain who developed or applied each part of a method. Supplier and customer specifications the employee worked to can be included where confidentiality permits, with sensitive commercial detail handled sensibly. Support the customer period with service contracts, purchase records, or access logs, and the employee period with payroll, tax, personnel, and internal assignment records. L-1B concerns special knowledge of the organization’s product and its application, or advanced knowledge of its processes or procedures, rather than travel frequency or generic expertise. Customer names, personal data, and unrelated commercial terms may often be removed, but dates, technical context, authorship, and the applicant’s contribution must remain intelligible. The usual error is submitting a certificate of fluency and a translated manual while omitting how the employee learned and applied the petitioning group’s knowledge.