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In this study, based on the findings of a typological survey concerning alternations in son/C clusters (a consonant cluster in which at least one consonant is a sonorant), I argue that phonological modifications of son/C clusters in Korean are motivated by the poor perceptibility of a segment in contexts with weaker phonetic cues rather than by the Syllable Contact Law as discussed in Rice & Avery (1991), Iverson & Sohn (1994), Davis & Shin (1999), among others. In addition, I argue that a positional restriction of /l/ also motivates phonological change of son/C clusters in Korean.