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Duolingo
Overview
Duolingo is a software company based in the United States, specializing in mobile app development for language learning. Founded in 2011, the company has grown to employ between 501 and 1,000 individuals and reported significant revenue. One of its key offerings is the Duolingo English Test (DET), which assesses various language skills, including listening. A recent research report outlines the operationalization and measurement of listening skills within the DET framework, emphasizing the importance of subskills and cognitive processes in language assessment. The DET employs a computer-adaptive testing model that adjusts the difficulty of questions based on the test-taker's ability, providing a comprehensive evaluation of language proficiency through an overall score and multiple subscores. This approach reflects Duolingo's commitment to evidence-based assessment design and enhances the user experience by tailoring the testing process to individual capabilities. The company continues to engage in research to refine its assessment methodologies and improve the effectiveness of its language learning tools.