Standardization is a prerequisite of quality control in any field. Library field is not an exception. The bibliographic control structures of AACR2R, MARC, DDC, LCC, LCSH, ISBD are highly standardized and dependent on rigorous authority work, so that libraries and bibliographic utilities using these tools could provide effective quality services. In order to emphasize the importance of standardization in the field of bibliographic control structures, this study focuses on inconsistencies in transliterated foreign personal and geographic names in headings, used as the caption of a given class as well as in notes describing what is found in a class or clarifying the notation hierarchy in the 4th edition of KDC. This study also examines Korean transliteration of loan words in the schedule as well as the transliterated entries of the Relative Index.