The Effects of Montessori and Head Start Environments on the Social-Emotional Development of Preschool-Aged Children Donna J. Wise May 2003 Research on the effects of learning environments on the social-emotional development of preschool children has gained increasing interest among practitioners and researchers. This study examined the effects of learning environments on the social-emotional development of the children enrolled in a Head Start Program that utilizes the Montessori curriculum. The present investigation examined a teacher’s ratings of children’s protective factors to determine if the Montessori class demonstrated superior socialemotional behavior compared to a traditional the Head Start class. There were no statistical controls for confounding variables such as selection of class in which children are enrolled, teacher interaction with children, and teacher temperament. Further, there was no pre test given. Although the Montessori class demonstrated a slightly higher rating for attachment and the Head Start class demonstrated a slightly higher rating for self-control and behavior, neither of these differences were significant. Findings suggested that developmentally appropriate preschool environments aid in the facilitation of social-emotional development of the children regardless of the curriculum.