Data from a large public school district (referred to as Site 1 from this point on) for Grades 2 through 8 for the 1999 student population were analyzed for all students including English language learners (ELLs). The data included student responses to the reading and mathematics subtests of the Iowa Tests of Basic Skills 2 (ITBS) and student background data such as race, gender, birth date, and number of years of participation in a bilingual education program (number of years of bilingual service). Descriptive statistics and the percent of over-achievement of non-ELL students over ELL students were computed and compared across the different subtest content areas. In multiple regression analyses, student English learning status was related to student test scores and background variables. A state department of education (referred to as Site 2 from this point on) provided us with student background data and item-level data on the Stanford Achievement Test Series, Ninth Edition (Stanford 9) 3 for all students in Grades 2 through 11 who were enrolled in the public schools statewide for the 1997-1998 academic year. Descriptive statistics compared ELL and non-ELL student performance by subgroup and across the different content areas. In a canonical correlation model the relationship between student language proficiency level, parent education, and family socioeconomic status (SES) (the Set 2 variables) and Stanford 9 performance (the Set 1 variables) was examined.