A major classic of sociology, Harold Garfinkel's work "Studies in Ethnomethodology," once revolutionized the social sciences by discarding conventional theories and making everyday human actions the subject of research. According to his thesis, social reality is constructed through practical everyday actions. Garfinkel focused on these practices that seem self-evident to us. The book, published in the USA in 1967, has long been regarded as one of the great classics of the social sciences. Now, finally, on the 100th birthday of the author, this groundbreaking study is also available in German.