“…Over the last two decades, one of the topics in educational psychology research has focused on responding to the need for more empirically validated studies to assess how effectively teachers' professional development (TPD) improves their selfefficacy, knowledge, skills, and teaching practice as well as how TPD contributes to their personal, social, and emotional growth as teachers. This literature review includes some of these contributions and others from other disciplines that have also provided knowledge about the impact that TPD has on teachers' and students' learning (Penuel et al, 2007;Pianta et al, 2008;Desimone, 2009;Hill et al, 2013;Desimone and Garet, 2015;Gutierrez-Cobo et al, 2019;Kurtovic et al, 2019). Desimone and Garet (2015) suggest five key features on which there is consensus that they make TPD effective: (a) content focus: activities that are focused on subject matter content and how students learn that content; (b) active learning: opportunities for teachers to observe, receive feedback, analyze student work, or make presentations, as opposed to passively listening to lectures; (c) coherence: content, goals, and activities that are consistent with the school curriculum and goals, teacher knowledge and beliefs, the needs of students, and school, district, and state reforms and policies; (d) sustained duration: TPD activities that are ongoing throughout the school year and include 20 h or more of contact time; and (e) collective participation: groups of teachers from the same grade, subject, or school participate in TPD activities together to build an interactive learning community (Desimone and Garet, 2015, p. 253).…”