Each of the families in the project adopted a child in the late 1970s or early 1980s. Data were first collected from families and birth mothers between 1987 and 1992 (Wave 1), again between 1996 and 2000 (Wave 2), between 2005 - 2008 (Wave 3), and between 2012 - 2014 (Wave 4).
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Four waves of Measures were administered for the different stages of development: Child, Adolescent, Emerging Adult, and Young Adult.