What is Vygotsky's term for the level at which a child can almost, but not quite, understand or perform a task?

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The term "zone of proximal development" refers to the difference between what a learner can do without help and what he or she can achieve with guidance and encouragement from a skilled partner. Vygotsky introduced this concept to explain how children's cognitive abilities are developed through social interactions.

What Is Vygotsky's Term for the Level at Which a Child