First published in 1984, this is a study of categorization practices: how people categorize each other and their actions; how they describe, infer, and judge. The book presents a sociological analysis and description of practical activities and makes a cogent contribution to the study of how the moral order actually works in practical communicative contexts. Among the issues dealt with are: collectivity categorizations, the organization of lists and descriptions, moral attribution and inferences, and the relationship between standards of morality and standards of rationality.