A previous version of this paper was presented at the 1984 Academy of Management annual meeting. The authors gratefully acknowledge research support from the National Science Foundation (SES 7924905), the CenterforAdvanced Study in the Behavioral Sciences (BNS 76-22943), and the Stanford Graduate School of Business. Teri Bush, Kelsa Duffy, and Jill Fukuhara provided splendid technical support. Howard Aldrich, Robert Althauser, Yinon Cohen, Frank Dobbin, Paul Osterman, and the ASQ reviewers and editors offered helpful comments on earlier versions of this paper. This paper analyzes data describing jobs in 100 establishments in order to test hypotheses about the characteristics of jobs and organizations associated with the structure of internal promotion ladders. The diversity of labor market arrangements found within the organizations indicates only weak support for hypotheses linking internal labor markets to organizational or sectoral imperatives. Atthe job level, however, there is support for hypotheses linking job ladders to firm-specific skills, organizational structure, gender distinctions, technology, occupational differentiation, the institutional environment, and the interests of unions. The paper concludes with an examination of how promotion ladders are formed from clusters of jobs associated with each other by occupation, skill, or gender composition.e
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