Abstract
This paper proposes an interactive English vocabulary learning system that is geared to individual student's vocabulary learning objectives and vocabulary ability. The system uses a word's rank in word frequency list as its absolute difficulty level - a higher rank in list means it is a more common word and therefore should be learned first. The system lowers or raises difficulty level of vocabulary items displayed according to real-time assessment of a student's vocabulary ability. Temporarily mastered words re-appear according to Ebbinghaus' forgetting curve so that learner is prompted whenever she is about to forget word. A prototype of system is nicknamed the vocabulary treadmill and hosted on a website. It can be also be implemented on PDAs, cell phones and tablet PCs. The system has benefits of a natural vocabulary learning progression, high efficiency, individualized learning sequences, and capability for parents and teachers to monitor student learning activities and progress.
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