"Expressive Order" is a specialized book that introduces Affect Control Theory to a broad audience while providing professionals in sociology with deeper insights into the structure of this theory. The Affect Control Theory posits that individuals shape their social interactions in a way that the resulting impressions reinforce feelings about relevant identities, behaviors, and contexts. Emotions serve as signals indicating the course of confirming these feelings for each person. The book addresses a variety of social contexts, including intimate relationships, professional interactions, court proceedings, and international relations. It is divided into three parts: the first part offers an accessible introduction to the theory and numerous analyses of everyday situations. The second part contains mathematical derivations that define emotion-confirming behavior and the associated concepts. The third part describes the research program and the computer simulation software used in the research. This book is of interest to both students and professionals engaged in the study of social relationships.