Research into Language Difficulty

CEFR.AI calibrates language difficulty by combining text complexity with task demand.

CEFR.AI triangulation model Equilateral triangle with three evidence anchors: professional materials, CEFR.AI Test scores, and linguistic research. CEFR.AI Calibration Engine Professional Materials CEFR.AI Test Scores Linguistic Research
CEFR.AI Calibration Engine Professional Materials CEFR.AI Test Scores Linguistic Research

How We Calibrate

CEFR.AI Placement Scores

Real learner outcomes from CEFR.AI proprietary assessment.

Take the Test
Students reading in a classroom

Open Methodology

Scoring logic, assumptions, and calibration evidence are open for review so researchers can inspect, reproduce, and improve the method over time.

Research References

Official Tools

Analyse and Level Test are the first official CEFR.AI applications. They provide practical tools grounded in the same calibration framework and research methodology.

Analyse Level Test

Coming Soon

An open CEFR.AI API and third-party app directory are in development so external teams can build language products powered by CEFR.AI scoring and calibration.

Tools

Frameworks we Trust

CEFR (A1-C2) maps to GSE (10-90) so broad levels can be calibrated with finer precision.

Latest Research

View all posts

2024-12-26

Why Flesch-Kincaid Falls Short for CEFR Classification

Can native-speaker readability metrics really predict CEFR levels? Many online ESL/EFL text analysis tools have defaulted to using the Flesch-Kincaid readability index, simply because no specialized algorithms exist for language learners. Using 59 graded texts, we systematically test whether this widely-adopted solution actually works. While our investigation does reveal a...

Read post

2023-07-24

The Power of Language Frameworks

Effective language teaching requires matching learners with texts at the right level - challenging enough to promote growth, yet accessible enough to avoid frustration. When it comes to understanding how difficult a text is for language learners, two frameworks stand out: the Common European Framework of Reference for Languages (CEFR)...

Read post