. "2 The External Contexts of Work." The Changing Nature of Work: Implications for Occupational Analysis. Washington, DC: The National Academies Press, 1999.
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b Using as weights 1991 proportion of occupation and 1983 proportion of demographic group within occupation.
c Formal training refers to company training programs, including apprenticeships. It does not include informal on-the-job training, in-school training in high schools, postsecondary schools, colleges or universities, or training in the armed services.