The ZPD is the gap between what a learner does alone and with help. It isn’t a grade level, can’t be measured in advance, and is a moving target that emerges in the interaction itself; the practical question is how to give minimal help at the point of need.
Sources (as given)
Vygotsky (1978) Mind in Society pp. 86, 88; Wertsch (1985); Wells (1999) Dialogic Inquiry pp. 318–19 (“a moving target”); Lantolf (ed., 2000); Kinginger (2002) Applied Linguistics 23/2.
Implications
- Teach to what learners nearly have (readiness felt in the moment), not a pre-set order.
- Minimal help first; recasts and reformulation at the point of need.
- Assess what learners can do with help, not only alone (Vygotsky’s two-children example) → dynamic assessment.
Counterarguments
- Kinginger: “ZPD” has been appropriated to rebrand grammar practice.
- Lantolf rejects any equation of ZPD with Krashen’s i+1; Thornbury agrees they’re “poles apart” (input processed individually vs development co-constructed).
DELTA framing (Claude)
Don’t write “ZPD = i+1”. Contrast: Krashen (cognitive, input), Vygotsky (sociocultural, mediated activity). Dynamic assessment (Lantolf & Poehner) is the assessment corollary.
Connections
Pitch tasks inside the ZPD and hand over support · Scaffolding must be withdrawn - transfer of control · Krashen’s five hypotheses - what survives the critiques