Chapter 3:
Economic change and structures of classification

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Contents

				Page of Report
Industry classification				95
The Standard Industrial Classification System				97
The North American Industry Classification System				99
Occupational classifications				101
Purpose and value				101
Why classify occupations?				102
The early census approach				105
The revised census approach era				105
A period of transition				106
Response of the classification system to new products, technologies, and other changes				107
The Occupational Employment Survey				109
Patterns of change in the OES and SOC occupational classification systems				110
Future directions				111

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