  Adaptive learning systems stand apart from traditional learning systems by
offering a personalized learning experience to students according to their
different knowledge states. Adaptive systems collect and analyse students'
behavior data, update learner profiles, then accordingly provide timely
individualized feedback to each student. Such interactions between the learning
system and students can improve the engagement of students and the efficiency
of learning. This paper evaluates the effectiveness of an adaptive learning
system, "Yixue Squirrel AI" (or Yixue), on English and math learning in middle
school. The effectiveness of the Yixue's math and English learning systems is
respectively compared against (1) traditional classroom math instruction
conducted by expert human teachers and (2) BOXFiSH, another adaptive learning
platform for English language learning. Results suggest that students achieved
better performance using Yixue adaptive learning system than both traditional
classroom instruction by expert teachers and another adaptive learning
platform.
