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Early language competence is a reliable and powerful predictor of children’s success in school, and word gaps linked to socioeconomic status disparities have cascading effects on academic outcomes. While early research – such as the work of Hart and Risley (1995) – focused on gaps in vocabulary, growing evidence reveals wide gaps in syntax as well. Language is an interdependent developing system of vocabulary, syntax, and language processes, yet existing research has not evaluated how SES gaps compare for these language components or how these components are linked for children from lower- and higher-SES families. Such a profile is sorely needed to understand the course of language development in all children. A new language measure, the Quick Interactive Language Screener (QUILS), expands on other measures by evaluating preschoolers’ vocabulary and syntax knowledge, along with …