This chapter provides a detailed conception of social class. It explains the theoretical rationale for using the Goldthorpe class schema for studying patterns of social mobility and examines the implications of this method of class analysis for the study of social justice issues. The Goldthorpe approach is more theoretically developed and better documented from the point of view of operationalization than most other methods. It has a seven-fold classification, the categories of which are said to aggregate occupational groupings whose members share similar market and work situations.