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Computer-aided Pronunciation Training(CAPT)technologies enable the use of automatic speech recognition to detect mispronunciations in second language(L2)learners speech.In order to further facilitate learning,we aim to develop a principle-based method for generating a gradation of the severity of mispronunciations.This paper presents an approach towards gradation that is motivated by auditory perception.We have developed a computational method for generating a perceptual distance(PD)between two spoken phonemes.This is used to compute the auditory confusion of native(L1)language.