International concordance between the industrial classifications of the United Nations (ISIC REV 3) and Canada (1980 SIC), the European Union (NACE REV 1), the United States (1987 SIC).

This publication displays the relationship between the lowest or four-digit level of each of the three industrial classifications, the 1980 Canadian SIC, the 1987 U. S. SIC and NACE Rev.l, and the four-digit level of ISIC Rev.3 of the United Nations. [...] The links between the CDN SIC and ISIC and the U. S. SIC and ISIC are therefore, reversed and arranged in CDN SIC and U. S. SIC order, in Appendices A and B. The few Canadian and U. S. industries which cannot be directly linked to any particular ISIC class at the four- digit level are listed in Appendix C. There are a few cases in which (i) all three agencies have reason to interpret the content o [...] Structure of the classifications The overall approach towards creating the higher level structure of ISIC and the CDN and the U. S. SICs is similar, but the number of categories at the highest level and the way in which they are ordered is different. [...] The differences in the structures of the classifications are illustrated by the fact that currently about 28% of the four-digit classes of the CDN SIC, and 20% of the U. S. SIC, cross the boundaries of ISIC two-digit groups. [...] Some of the differences in the interpretation of the content of ISIC classes between the CDN and U. S. classifications and NACE stem from the use of the CPC to define the content of ISIC classes, on the part of NACE.