“…Since the 1970s the topic is being transferred to the schooling sector and educational research. In fact, most of the research in this field accredits collaboration to support many positive outcomes such as a better school quality (Goddard, Goddard, & TschannenMoran, 2007;Ronfeld, Matthew, Owens Farmer, McQueen, & Grissom, 2015), healthier teachers (Schaarschmidt, 2005) and -for this study the most important finding -a profound, positive impact on teacher professionalization (Avalos, 2011;Vangrieken, Dochy, Raes, & Kyndt, 2015).…”