 "” He further said that the ZPD “defines those functions that have not yet matured but are in the process of maturation, functions that will mature tomorrow but are currently in an embryonic state.” The zone is bracketed by the learner's current ability and the ability they can achieve with the aid of an instructor of some capacity.Vygotsky viewed the ZPD as a better way to explain the relation between children's learning and cognitive development.Prior to the ZPD, the relation between learning and development could be boiled down to the following three major positions