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| Year: | 1933, March 17 | ||
| Short description: | 1st documented use by Vygotsky of ZPD | ||
| Medium description: | 1st documented use by Vygotsky of ZPD (or ZBR, zona blizhaishego razvitia). Mentioned in lecture given Epshtein Institute of Experimental Defectology, Moscow. | ||
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