The book deals with the topic of students’ errors, which are considered an important educational phenomenon. The goal of this text is to introduce teacher error management behavior during whole-class interaction. From a theoretical point of view, the book pays attention to the conception of mistakes, error climate, and the role of teacher feedback during error situations. The book also presents qualitative research, that is focused on teachers’ approaches to mistakes and activities implemented during handling students’ mistakes. The results could be useful not only for teachers to reflect on their work with students’ errors but can also be inspiring material for undergraduate students.