“…There are only a few empirical studies that demonstrate effects of PD on teacher outcomes, practices as well as child development (Egert et al, 2018;Werner, Linting, Vermeer, and van IJzendoorn, 2016). For instance, some researchers demonstrated positive outcomes of their PD on teacher beliefs (King, 2014;Ottley et al, 2015) and practices (Kratzmann et al, 2017;Sachse et al, 2016). In Germany, Stitzinger and Lüdtke (2014) reported that their training helped staff, particularly bilingual staff, improve their knowledge and skills in assessing children"s language competences and diagnose language problems.…”