## Recent Posts

1. [What is face validity in language assessment?](https://blog.englishtest.duolingo.com/what-is-face-validity-language-assessment/) — Masha Kostromitina, Ph.D. (January 26, 2026)
2. [New research in Review of Education: Is predictive validity enough to measure student success?](https://blog.englishtest.duolingo.com/new-research-in-review-of-education-is-predictive-validity-enough-to-measure-student-success/) — Masha Kostromitina, Ph.D. (August 22, 2025)
3. [How does the DET measure speaking?](https://blog.englishtest.duolingo.com/how-does-duolingo-measure-speaking/) — Masha Kostromitina, Ph.D. (July 7, 2025)
4. [One test, many benefits: Why students and counsellors prefer the Duolingo English Test](https://blog.englishtest.duolingo.com/one-test-many-benefits-why-students-and-counsellors-prefer-the-duolingo-english-test/) — Masha Kostromitina, Ph.D. (May 15, 2025)
5. [Ask Dr. Masha: How do test takers feel about accents on high stakes English tests?](https://blog.englishtest.duolingo.com/how-do-test-takers-feel-about-accents-on-high-stakes-english-tests/) — Masha Kostromitina, Ph.D. (April 24, 2025)
6. [How does the DET measure writing?](https://blog.englishtest.duolingo.com/how-does-duolingo-measure-writing/) — Masha Kostromitina, Ph.D. (March 19, 2025)
7. [Is the Duolingo English Test aligned with the CEFR?](https://blog.englishtest.duolingo.com/duolingo-test-aligned-with-cefr/) — Masha Kostromitina, Ph.D. (October 17, 2024)
8. [How the Duolingo English Test can help institutions diversify](https://blog.englishtest.duolingo.com/how-can-universities-diversify/) — Masha Kostromitina, Ph.D. (September 24, 2024)
9. [Is the Duolingo English Test valid?](https://blog.englishtest.duolingo.com/is-the-duolingo-english-test-valid/) — Masha Kostromitina, Ph.D. (September 12, 2024)
10. [How well does the Duolingo English Test predict academic success?](https://blog.englishtest.duolingo.com/does-the-duolingo-english-test-predict-academic-success/) — Masha Kostromitina, Ph.D. (August 26, 2024)
11. [Is this normal? Parsing jagged profiles in language assessment](https://blog.englishtest.duolingo.com/is-this-normal-parsing-jagged-profiles-in-language-assessment/) — Masha Kostromitina, Ph.D. (March 12, 2024)
12. [The evolution of the Duolingo English Test](https://blog.englishtest.duolingo.com/duoling-english-test-different-versions/) — Masha Kostromitina, Ph.D. and Sophie Wodzak (February 7, 2024)