This paper criticizes the deskilling hypothesis for temporal change in occupations. Case studies of occupations alleged to support the deskilling hypothesis have typically been insensitive to the internal heterogeneity found within occupations, and to the fact that the boundary between adjacent occupations located on the same functional hierarchy can shift over time. When these factors are explicitly taken into account, it is found that apparently compelling evidence for the thesis of clerical downgrading better supports an alternative explanation, which might be called the process of status redefinition, an aspect of the process of professionalization. The case of clerical workers in the federal government is examined in some detail. Available evidence supports the argument that status redefinition occurred. Status redefinition and deskilling are not mutually exclusive explanations for change, though they do conflict in important respects. This paper suggests that case studies of occupations should focus on functional hierarchies, rather than specific occupations, in order to avoid the comparability problems which arise when occupational boundaries change.