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Surveys are one of the most popular ways to collect employee information. Because of their widespread use, data quality is an increasingly important concern. The purpose of this paper is to (1) introduce the intra-individual response variability (IRV) index as an easily calculated and flexible way to detect insufficient effort responding (IER); (2) examine the extent to which various IER indices detect the same or different respondents engaging in IER behavior; and (3) investigate relationships between individual differences and commonly used IER indices to better understand systematic and theoretically relevant IER behavior. In a two-part study, 199 undergraduates responded to questionnaires online, and various IER indices were calculated. The IRV index identifies different respondents than other IER indices. Values on the IRV index (as well as other IER indices) are related to scores on theoretically meaningful individual differences in conscientiousness, agreeableness, and boredom proneness. This study provides researchers with a robust, easily calculated, and flexible means for screening questionnaire data for IER behavior. Practical recommendations for finding and making decisions about IER behavior patterns are provided. This study introduces the IRV index, an extension of the long string, used to identify survey research participants who likely engaged in one type of IER behavior. It is also one of the first studies to evaluate the extent to which IER indices identify different respondents as having engaged in IER and provides additional evidence that values on these indices are related to individual differences. [ABSTRACT FROM AUTHOR]