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Internet Users' Information Privacy Concerns (IUIPC-10) is one of the mostendorsed privacy concern scales. It is widely used in the evaluation of humanfactors of PETs and the investigation of the privacy paradox. Even though itspredecessor Concern For Information Privacy (CFIP) has been evaluatedindependently and the instrument itself seen some scrutiny, we are stillmissing a dedicated confirmation of IUIPC-10, itself. We aim at closing thisgap by systematically analyzing IUIPC's construct validity and reliability. Weobtained three mutually independent samples with a total of $N = 1031$participants. We conducted a confirmatory factor analysis (CFA) on our mainsample. Having found weaknesses, we established further factor analyses toassert the dimensionality of IUIPC-10. We proposed a respecified instrumentIUIPC-8 with improved psychometric properties. Finally, we validated ourfindings on a validation sample. While we could confirm the overallthree-dimensionality of IUIPC-10, we found that IUIPC-10 consistently failedconstruct validity and reliability evaluations, calling into question theunidimensionality of its sub-scales Awareness and Control. Our respecifiedscale IUIPC-8 offers a statistically significantly better model and outperformsIUIPC-10's construct validity and reliability. The disconfirming evidence onthe construct validity raises doubts how well IUIPC-10 measures the latentvariable information privacy concern. The sub-par reliability could yieldspurious and erratic results as well as attenuate relations with other latentvariables, such as behavior. Thereby, the instrument could confound studies ofhuman factors of PETs or the privacy paradox, in general.

Validity and Reliability of the Scale Internet Users' Information Privacy Concern (IUIPC) [Extended Version]