Methodology

NAICS 2022 / 2017 — imported from the official Census Bureau Excel structure and concordance files. Titles and descriptions are reproduced verbatim; hierarchy (sector → subsector → industry group → industry → national industry) is derived from code length and the official parent structure.

SIC 1987 — imported from the official SEC SIC code list. Each code retains its SEC office classification.

SBA size standards — matched to NAICS from the SBA Table of Size Standards (effective March 17, 2023). Footnotes and receipts-based changes are included where the source provides them.

SOC / O*NET — imported from the O*NET 30.2 database (U.S. Department of Labor), including job zones and descriptions.

PSC — imported from the GSA Product Service Codes Manual (April 2025).

UNSPSC — imported from the O*NET UNSPSC reference (GS1 US open standard).

Schedule B — imported from the Census Bureau Schedule B 2026 fixed-width file, including NAICS, SITC, and End-Use references.

HTSUS — imported from the USITC HTS 2026 Basic Edition CSV, including duty rate columns.

Official concordances — NAICS 2022-to-2017 and Schedule B-to-HTS use official Census/USITC correspondence tables where they exist.

Heuristic mapping — SIC-to-NAICS and code-to-occupation links use title word-overlap scoring. These are suggestions, not authoritative conversions. They are clearly labeled as heuristic.

Risk Score — the score is deterministic, computed from seven verifiable factors: official-source verification, international match, edition migration path, hierarchy completeness, SBA documentation, trade-code match, and SIC crosswalk. Each factor is shown on the page. No random or hidden weighting.