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Despite the ever-increasing use and reliance on survey research data in the social science nowadays, an undue attention has been paid in Korea as to how item non-responses (or, DK responses, shortly), as one of the most important criteria for quality data, vary by certain characteristics of the respondents and survey setting and what precisely accounts for the variation. In an attempt to fill this gap, this study tries to identify the correlates of DK responses. An extensive review of methods literature suggests several important correlates of respondent and survey characteristics, and the associations postulated between each correlate and DK responses are subject to a scrutinized statistical analysis by using the cumulative, five-year rounds (2003-7) data sets of the KGSS. Results of correlation and OLS regression analyses confirm most of the predictions by demonstrating that DK responses, on average, are a function of two over-arching meta-components of respondent cognitive sophistication and normative social obligation. The findings are interpreted and a few methodological implications stemming from them are discussed with suggesting some recommendations for further studies.