The purpose of this study is to reconsiderate the concept of zone of proximal development by L.S.Vygotsky. Although there has been a recent upsurge of in Vygotsky's theory, most of interst has centered on the role Zone of Proximal Development was equivocal applied in many studies. For example, there is a famous concept of "Scaffolding" by Wood et al. Several studies have been made on "How to scaffolding" and "How to fading" and teacher-child interaction. In child care practice, it is more complex than an educational utopia. There is assumption that the role of the "social other" is presented as always helpful. The possibility that might be overbusy for the child and be ignored to scaffoldings, and be purposelly harmful. We have to consider that ZPD and the "Scaffolding" are not as "Child-Teacher" in two terms but as "Child-Teacher-Object" in the triangle.