The comparative student of man's work learns about doctors by studying plumbers; and about prostitutes by studying psychiatrists. This is not to suggest any degree of similarity greater than chance expectation between the members of these pairs, but simply to indicate that the student starts with the assumption that all kinds of work belong in the same series, regardless of their places in prestige or ethical ratings. In order to learn, however, one must find a frame of reference applicable to all cases without regard to such ratings. To this end, we seek for the common themes in human work. One such theme is that of routine and emergency. By this I mean that one man's routine of work is made up of the emergencies of other people. In this respect, the pairs of occupations named above do perhaps have some rather close similarities. Both the physician and the plumber do practice esoteric techniques for the benefit of people in distress. The psychiatrist and the prostitute must both take care not to become too personally involved with clients who come to them with rather intimate problems. I believe that in the study of work, as in that of other human activities and institutions, progress is apt to be commensurate with our ability to draw a wide range of pertinent cases into view. The wider the range, the more we are forced to find a fundamental frame of reference.