Research

Open notes on text + task difficulty modeling

Zone of Proximal Development in Language Learning

Published: 2026-03-17 | Authors: CEFR.AI | Framework Note

The Zone of Proximal Development (ZPD) is one of the most useful ideas in language education, but it is often described too vaguely to guide real decisions. In practical terms, ZPD is the space between what a learner can do independently and what they can do with support. For CEFR.AI,...

The Power of Language Frameworks

Published: 2023-07-24 | Authors: CEFR.AI | Framework Note

Language frameworks are not optional in language learning; they are the minimum structure required for reliable decisions. If we want to match learners with texts and tasks that are challenging but manageable, we need shared standards for what “difficulty” means. This note is a simple introduction to language frameworks: why...