Preschool Early Head Start (EHS) Program to develop, implement, and evaluate a home-based curriculum for EHS parents and their young children. The new curriculum, Windows of Opportunity, focused on building the capacity of parents to use everyday learning opportunities as the basis for promoting their child's cognitive and social-emotional development. Participants included eight teachers trained to use the curriculum with 80 families from a local EHS program. A multiple baseline design assessed the extent to which the teacher training influences teachers' use of the targeted practices and to ascertain parents' use of the targeted practices. The Windows of Opportunity curriculum would begin to meet the need for a home-based curriculum that builds on parents' capacity to foster their child's development as part of the everyday activities and routines.