Vocabulary skills are important for overall reading competence, but vocabulary assessment approaches that inform instructional decision-making and are sensitive to improvement are limited. This article describes a process for developing vocabulary measures designed to facilitate data-driven decision-making for kindergarten and first-grade students…

In response to a request for additional analyses, in particular reporting confidence intervals around the results, we re-analyzed the data from prior studies. This supplementary report presents the results of the additional analyses addressing classification accuracy, reliability, and criterion-related validity evidence. For ease of reference, we…