Web Resources for learning about Lev Vygotsky
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Stephen Krashen's Theory of Second Language - Vygotsky's concept of zone
of proximal development is very similar to Krashen's input hypothesis.
According to this hypothesis, language acquisition takes place when the
learner receives second language 'input' that is one step beyond his/her
current stage of linguistic competence.
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http://www.english.sk.com.br/sk-krash.html