Concordance Definition
A mapping or crosswalk table that bridges two different classification structures, such as aligning legacy 1987 SIC codes to modern 2022 NAICS categories.
Related Guides & Tools
- SIC Codes Explained: History, Structure, and Concordances — The complete history and structural layout of the 1987 Standard Industrial Classification (SIC) system, including its legacy role.
- How to Perform a SIC to NAICS Crosswalk Conversion — A technical walkthrough demonstrating how to map legacy SIC codes to modern 2022 NAICS categories using historical concordances.
- SIC ↔ NAICS Concordance Crosswalk — Search and map old SIC codes to modern formats.