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In recent years an increasing number of academic disciplines, including IS, have sourced digital trace data for their research. Notwithstanding the potential of such data in (re)investigations of various phenomena of interest that would otherwise be difficult or impossible to study using other sources of data, we view the quality of digital trace data as an underappreciated issue in IS research. To initiate a discussion of how to evaluate and report on the quality of digital trace data in IS research, we couch our arguments within the broader tradition of research on data quality. We explain how the uncontrolled nature of digital trace data creates unique challenges for IS researchers, who need to collect, store, retrieve, and transform those data for the purpose of numerical analysis. We then draw parallels with concepts and patterns commonly used in data analysis projects and argue that, although IS researchers probably …