He described the ZPD as interacting with someone who is more advanced in a skill to improve his own. The theory is based on the idea of ​​the “upper limit”. That when more capable people, such as teachers, provide assistance to children, they are able to complete tasks that they would not normally be able to complete on their own. The limitation of Vygotsky's theories is that they are difficult to apply to children with disabilities. This is because his work was designed around children who had neither physical nor learning disabilities, making it difficult to apply his theories to children who have special needs. Vygotsky, however, discussed this topic in his theory of the Zone of Proximal Development, stating that what is important for disabled children is what they are able to do, rather than what they should do (Wang, 2009). Lev Vygotsky's work has been used as a foundational theory for the development of many other theories and ideas about childhood educational and psychological development over the years. It has been used by many in education as a way to teach and improve children's learning and has been studied by psychologists of all backgrounds for decades despite its limitations. His work, however, was the turning point that laid the foundations for the modern