Documents tying her to the consultancy’s own framework: version histories with her contributions, internal training records, client deliverables that used the method, and a comparison explaining why an external hire would need extended training.
Anchor the knowledge in the company’s own artifacts
USCIS evaluates specialized knowledge by asking whether the knowledge is of the petitioner’s product or processes and whether it is distinct or advanced relative to others in the company or the field. Generic GIS certificates prove skill in the market; they do not show company-specific knowledge. Useful evidence includes repository logs or change records naming the analyst, design documents she authored, calibration reports she signed, a training curriculum she delivered to colleagues and a statement from the technical director explaining the framework, its confidentiality and the time a new hydrologist needs to become productive with it. Client reports that reference the method show its commercial role. Present these as a coherent narrative rather than a file dump, and keep any confidential technical content summarized with a note that full material is available on request.
Documents should distinguish proprietary knowledge from experience that a skilled hire could obtain quickly. Training matrices, access records, controlled manuals, project histories, and letters from knowledgeable managers can show both the content of the knowledge and how the worker acquired it. If the assignment is at a client's site, the agreement must also show that the petitioner retains direction and that the work uses its own product or process. Hypothetical example: a freight-software firm sends a routing-configuration specialist to a retailer. The client contract identifies the firm's platform and its project manager, preventing the record from looking like ordinary staff augmentation.