The pure numerical grade as a result of performance assessment no longer meets the requirements placed on modern competency- and diversity-oriented teaching. In a classroom focused on "learning to learn," students' performances, skills, and competencies must be assessed and evaluated in a differentiated manner. The book by Eiko Jürgens and Urban Lissmann provides a compact and consistently practice-oriented overview. This foundational work offers teachers in training and practice a theoretically grounded insight into pedagogical diagnostics. It clearly presents both classical and alternative methods and tools for performance assessment and relates them to practical applications and the standards of teacher education.