Research has shown that early interventions are crucial for children with ASD, as they can greatly benefit from them. A smooth transition from preschool to primary education can also ensure their continued success and development (Ganz, 2007; Rogers, 2009). The transition to primary school is a critical milestone in early childhood education. As Currie (2001) noted, “it marks the beginning of a new stage in the child’s educational journey and can have long-term consequences for their academic and social development.” For young children with autism spectrum disorder (ASD), a smooth transition from preschool to primary education can set the stage for future success in school and beyond. Unfortunately, the change from a familiar, structured environment to an unfamiliar, unstructured one can be particularly challenging for children with ASD, who often have difficulty with change and transitions” (Zucker & Lawton, 2017). Transitioning from pre-school to primary education is often marked by a number of challenges, including changes in routine, unfamiliar social and physical environments, and a lack of familiarity with new teachers and peers (Chawarska, Klin, & Volkmar, 2008). Therefore, there is a critical need for effective interventions to support children with ASD during this transition period. The main goal of the Ready4School project is to increase the quality of special and inclusive preschool programs for children with autism spectrum disorders (ASD), and facilitate improved transitions from preschool to primary education. The project aims to achieve these goals by developing, testing, and publishing an innovative assessment and programming educational kit for preschool teachers working with children with ASD. Resultantly, the concrete outcomes of the project will be an innovative and effective educational kit based on the principles of ABA and adapted to be easily implemented by educators without formal ABA training. To further promote accessibility, the developmental assessment with school readiness checkpoints/assessment tool based on the preschool teaching curriculum, detailed lesson plans following the teaching curriculum, and data sheets for successful monitoring and evaluation of progress will be made digitally available.