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Hong, Mi-Ju. 2003. A Sociolinguistic Analysis on the Use of Substantive Stem-final Consonants (ch) and (th). The Sociolinguistic Journal of Korea, 11(1). The aim of this study is to explain the direction of the phonological variations and changes in Korean through analyzing the co-variation of sociolinguistic parameters with phonological material appearing in the speech community of Daegu. The 33 imformants were classified by age and degree of education for sociolinguistic analysis. The phonological variables analyzed in this study are the substantive stem-final consonants: ch, th. It was found that variations in the everyday pronunciation of ch→s, th→s and th→ch(nominative form and objective form) increased by generations, appearing especially in the younger generation. These same variations were also more prevalent in those with a higher degree of education. However, the use of ch→th increased in those with a lower degree of education. Therefore from a synchronical view, these realizations are contemporary changes in Daegu. If these same changes continue, the future will see their use in a greater proportion of each subsequent generation. Especially ch→s and th→s realization may be an infancy step in those progress.