Crossing from kindergarten to the first grade of elementary school is one of the most important events in a child's life.The most important role in pre-school life is a family, an educator, and then a teacher. The family is the foundation for creating a successful student, for transferring love for school, and creating positive thoughts about their future expectations. Educators help children to discover the world around them, while the role of teachers is transferring knowledge. The aim of the research in this paper was to identify differences or similarities in the opinions and experiences of teachers and educators in the Republic of Croatia regarding the readiness of kindergarten children to move to the first grade of elementary school and to identify differences in the educational system between kindergartens and elementary schools. It is also important to consider the children's opinions, because they are the most important participants in the educational system. Encouraged by the opinions of teachers and educators, we should ask ourselfs how much the system between kindergartens and schools is connected, in fact, what should be done for the child's transition from kindergarten to school, to avoid major consequences for the child.