Family Life Project: A Longitudinal Adoption Study, 1969-1989

This 20-year longitudinal study, begun in 1969-1970, examines the influence of adoption on child and family development in intraracial, transracial, single-parent, and two-parent adoptive and biological families. Data collection included child, parent, and family interviews; and child completion of psychological tests, and questionnaires about racial and gender identity (e.g., Doll Puzzle, Doll Test, Semantic Differential Pictures, Toy Preferential Pictures, Piers-Harris Children's Self-Concept Scale, and the Personal Attributes Questionnaire), intelligence (e.g., Preschool Attainment Record, Peabody Picture Vocabulary Test, and the Slosson Intelligence Test for Children and Adults), and social maturity (i.e., the Vineland Social Maturity Scale).