Ethnomethodology is an approach to studying human interaction that focuses on how people make sense of their social world and communicate shared understandings. It assumes that members of society have shared methods to construct meaningful social situations. A key method is "breaching experiments" where sociologists violate social norms to study how people respond. The document discusses breaching experiments, key theorists like Garfinkel and Sacks, and areas of focus for ethnomethodology like institutional settings, challenges to record keeping, and conversational analysis. It raises questions about whether ethnomethodology is a valid form of sociology and how it addresses power.