Between 1976 and 1979, Head Start, as part of its strategy for Spanish-speaking children, funded four institutions for the purpose of developing and implementing four distinct bilingual bicultural preschool curriculum models for use with Spanish-speaking children. In 1977, the Research, Demonstration, and Evaluation Division of the Administration for Children, Youth, and Families commissioned Juarez and Associates Inc. to conduct an evaluation of the Head Start Bilingual Bicultural Curriculum Development Project. The study, which was conducted over a 3 1/2-year period in eight Head Start centers in communities with relatively large Hispanic populations, focused on the impact of the four bilingual bicultural preschool curriculum models on the children, their parents, and their teachers. This document provides an executive summary of the study's evaluation design, the findings of the study, and the implications of these findings. (Author/MP)