Shulruf, B., & Wang, G. (2011). Parent influence on outcomes for children: HIPPY as a cost-effective option. Revista De Cercetare Si Interventie Sociala, 34, 7-20. Model(s): Home Instruction for Parents of Preschool Youngsters (HIPPY)® Does not pass screens Screening conclusion: This citation is not a primary study Study reviewed under: Handbook of Procedures and Standards, Version 1