Method: To explore the relationship between SES and language domain (vocabulary, syntax, process), the QUILS was administered to 212 kindergartners.
Results: Children from very-high poverty schools performed significantly below children from high poverty and mid-low poverty schools.
Implications: SES impacts language-learning processes (i.e., fast mapping) in addition to language products (i.e., vocabulary, syntax).
Keywords: QUILS; kindergarten; language screening; socioeconomic status.