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Special Education Elementary Longitudinal Study (SEELS)
SRI documented the school experiences and outcomes of a national sample of students as they moved from elementary to middle school and from middle to high school.
SEELS was a six-year study of a nationally representative sample of students receiving special education who were ages 6-12 at the inception of the study.
Students were selected randomly from those receiving special education services in about 300 school districts nationwide. SEELS was a conceptually ambitious project, collecting information about sample members in three waves as children progressed through school. It documented their functional abilities, educational and related services, and academic and social outcomes.
Statistical summaries generated from SEELS generalized to special education students nationally as a group, to each of the federal special education disability categories, and to each single-year age cohort. A major analytic focus of SEELS was to identify combinations of curricula, instruction, and other services that correlate with developmental growth in key areas and with school success. Data were collected repeatedly through telephone interviews with parents, surveys of school staff, and direct assessments of students' academic skills and knowledge (with accommodations).