The document discusses Vygotsky's zone of proximal development (ZPD). It uses the example of a boy named James who wants to learn the card game Yu-Gi-Oh from his more knowledgeable brother Ali. With Ali's guidance and support, James is able to learn the game in his ZPD. Once James masters the game, that skill will move out of his ZPD and he will be able to play independently. The document also notes that a more knowledgeable other (MKO), such as a teacher or peer, can help a learner develop skills within their ZPD.