Check out Lois Holzman’s latest article offering a new take on the Vygotskian concept of Zones of Proximal Development:
Holzman, L. (2018) Zones of Proximal Development: Mundane and Magical. In J. P. Lantolf, M. E. Poehner & M. Swain (Eds.), The Routledge Handbook of Sociocultural Theory and Second Language Development (Routledge Handbooks in Applied Linguistics),