NAICS 2007 Implementation in Mass Layoff Statistics
Every five years, the North American Industry Classification System
(NAICS) is updated to reflect changes in the U.S. economy, recognize new
and emerging industries, and strive for international compatibility. In
the MLS program, industry information for employers is obtained from the
BLS Quarterly Census of Employment and Wages (QCEW) program.
NAICS 2007 Changes
Revisions associated with converting to the 2007 version of NAICS were
limited in scope. Of the 1,179 industries used by BLS under NAICS 2002, 21
industries were revised. Eight industries directly transferred to one NAICS
2007 code, while the remaining 13 industries split into more than one
NAICS 2007 code. For many of the split industry revisions, the original
was often retained with minor definitional changes. A complete list of
NAICS 2007 industries with further information on the changes associated
with moving from the 2002 NAICS is available on the Census Bureaus NAICS
page, which can be accessed at www.census.gov/epcd/www/naics.html.
Implementation in the MLS Program
The MLS program implemented the 2007 version of NAICS beginning with
January 2008 mass layoff data, released on February 27, 2008.
The first publication of quarterly extended mass layoff data using NAICS
2007 were issued with the release of first quarter 2008 data on May 15,
2008. MLS data are published at the major sector level and the subsector
level (3-digit NAICS).
Layoff events prior to 2008 with one of the eight NAICS 2002 codes that
directly transfer to a NAICS 2007 industry were changed to the NAICS
2007 industry in order to minimize the number of data series breaks. This
resulted in slight, one-time revisions to NAICS 518 (data processing,
hosting and related services) and NAICS 519 (other information services).
Pre-2008 events with one of the thirteen NAICS 2002 industries that
split into more than one NAICS 2007 industry were not changed.
Therefore, data for these industries beginning in 2008 are not
strictly comparable to pre-2008 information, though differences are not
likely to be significant. Affected industries at the major sector level
included administrative and waste services, finance and insurance,
professional and technical services, and real estate and rental and
leasing. At the subsector level, 15 industries were affected.
Previous Industry Changes in the MLS Program
The MLS program switched to the North American Industry Classification
System (NAICS) in 2002. More information on this change is available at www.bls.gov/mls/mlsnaicsnote.htm.
Last Modified Date: May 15, 2008