The development and validation of the Home Learning Environment Profile (HLEP) are outlined. The HLEP instrument was designed to assess successful preschool home educational programs for Hawaiian families. The instrument covers sociodemographic, cultural, and environmental factors of Hawaiian families. After an extensive review of published instruments, an interdisciplinary team of researchers and program developers was formed to draft and pilot the interview instrument. Item and cluster analyses and reliability computations were preformed for 42 female and 41 male children enrolled in Kamehameha Schools' (Hawaii) preschools. Seven scales were derived to assess home learning experience, parental responsibility for teaching, parental expectations, educational engagement, child autonomy, reported time allocated by the child to 10 home activities, and time allocated to preferred home activities out of the 10 specified. The most interesting finding of this research is that a rigorous assessment of home environment variables can be as predictive of educational achievement of young children as are individually administered intelligence tests. HLEP scales correlate differentially with tests of verbal, quantitative, and psychomotor skills. These findings indicate that intelligence test scores and status measures, such as socioeconomic status and birth order, represent predictive dead ends. Eighteen data tables and two bar graphs are included. (TJH)