Methods of internal labor market analysis for three organizational areas are presented, along with some evidence about the validity and utility of conceptual descriptions of such markets. The general concept of an internal labor market refers to the process of pricing and allocation of manpower resources with an employing organization and rests upon the hypothesis that these processes within an organization are very different from the external market processes. The three markets analyzed differed in several respects which might be expected to influence internal market characteristics. One market consisted of a single department of a steel company, another the managerial-professional-technical positions in a large insurance company, and the third the manufacturing labor force in a computer and office equipment manufacturer. Application of a Markov model provided empirical characterizations of these markets useful for manpower allocation processes of employing organizations. However, the range of internal labor market characteristics observed among firms raises doubts about the utility of a single conceptual model of this market. (MF)