Teachers’ PD is considered to be an important part of the teaching profession. It is seen as a tool for constant further development for teachers to adapt to changing standards in schools and classrooms, requirements for students, and personal challenges associated with the daily work in school. However, it is repeatedly claimed that there is no sufficient research with regard to teachers’ participation in formal PD, as well as of aspects that may influence their PD behavior. In spite of a large number of studies that contribute to this question within Germany, Austria, and Switzerland, only a few of them are cited regularly. Since much of this research is published in German, the results are not accessible for international researchers and comparisons between different countries. This comprehensive review makes these result accessible. weiterlesen