The handbook provides a solid introduction to the fundamentals and variations of Grounded Theory, aimed at both students and first-time users as well as experienced researchers. The volume imparts foundational knowledge for successful research practice, discusses desiderata, presents application-related key concepts, and outlines options for the constructive interplay of Grounded Theory with alternative research programs. Additionally, it offers guidance for research practice and higher education teaching. The volume provides a concise overview of schools, methodological desiderata, as well as key concepts and application-related aspects.