This survey is a partial replication study of a community with the fictitious name of Regionville which was first studied by Koos in the period 1946–50 (1). In the present paper, we are concerned only with that part having to do with the distribution of disease. Though differences in methods do not allow for a true replication, the indications are that social classes are much more similar in their reported experience of disability now than they were a generation ago. Sources of bias are examined, and it is suggested that differential perceptions of appropriate sick role behaviour may contaminate the findings. Moreover, the sample probably did not include a large enough number of the poverty-stricken population—which is a rather small proportion of the total population—to discover such differences as might in fact exist. It is concluded, however, that the findings do represent a real change in the distribution of disability in the population of Regionville.