Bradley, R. H., & Gilkey, B. (2002). The impact of the Home Instructional Program for Preschool Youngsters (HIPPY) on school performance in 3rd and 6th grades. Early Education and Development, 13(3), 301–311. Model(s): Home Instruction for Parents of Preschool Youngsters (HIPPY)® Low rating Study reviewed under: Handbook of Procedures and Standards, Version 1