“…The preschool teachers stated that practices they realized facilitated the adaptation of the children to the process, they performed an effective classroom management, activities in class were transformed into non-monotone activities and evolved into a more amusing process, and the participation of the children was also at a high level. Previous research (Burchinal, Cryer, Clifford & Howes, 2002;Dunst, 2015;Honig & Hirallal, 1998;Toran, 2019;Vu et al, 2015;Williams, 2010) determined that in professional development programs, preschool teachers transformed themselves in a positive manner, this transformation also rapidly reflected to the quality inclass practices, and the professional satisfaction of teachers increased. In this study, on the other hand, it was highlighted that the preschool teachers noticed certain wrong practices they realized before the in-service training and by leaving such wrong practices, they realized more effective practices paying regard to the high benefit for children.…”