The adaptation of the child in the first grade, namely the cooperation and of the school with the parents in this regard is one of the most discussed issues today. The purpose of this study was to explore the perceptions of teachers and parents on the adaptation of first graders during the transition from preschool to first grade. Specifically, to explore the perceptions of transition parents through first graders parents. In terms of design, the study is exploratory, ie of a qualitative nature. The study conducted 21 interviews, 12 with first grades teachers and 9 with parents, of first grade children as well. The study used an analytical framework in order to identify the factors in the adaptation of students in the first grade as a problem of teachers and challenging factors in this regard, as well as the experience of parents in this regard. Descriptive statistical analysis was used to analyze the study findings. The results assumed a common opinion among the representatives of the sample, teachers and parents. The study makes us understand that parents are satisfied with the work of teachers in terms of adaptation of the child, but on the other hand we find that teachers consider that professionalism is still needed in this regard. The study also shows that teachers recommend training teachers for their professionalism in child adaptation.