Duolingo's program is built on three pillars of cognitive science: spaced repetition algorithms, microlearning theory, and multimodal input. The patented Adaptive Spaced Repetition System (SRS) precisely calculates the optimal point in time to review each word, increasing memorization efficiency by 2,101 TP3 T. Lessons are broken down into 5-10 minute micro-units, which meets the capacity constraints of the human working memory, and studies have shown that this design results in retention of focus up to 921 TP3T. 92%.
Each learning module strictly follows the four-dimensional training method of "Listening-Speaking-Reading-Writing": Listening exercises are recorded by real native speakers and the speed of speech is adjustable in three levels; Speaking exercises use cutting-edge speech recognition technology to detect hyphenation and intonation problems; and Writing exercises include gradual training from vocabulary to complex sentence patterns. The difficulty of the course is divided into six levels, A1-C2, according to the CEFR standard, and the difficulty of the questions is dynamically adjusted through machine learning to ensure that the 85% exercises are in the user's "zone of nearest development".
This answer comes from the articleDuolingo: an interactive tool for learning more than 40 languages for freeThe
