Qualitative research and its methods are an important approach in the pursuit of psychological knowledge. While qualitative approaches are standard in neighboring scientific fields, this tradition has been neglected in psychology for decades. The first edition from 2010 initiated a turning point. The new edition, featuring 70 contributions, is published in two volumes and represents the establishment and further development of a qualitative psychology. Volume I presents central positions that provide a theoretical foundation for qualitative research in psychology. Following that, a wide range of application areas and subdisciplinary fields of work are addressed.