No Two Alike expands on some of the ideas from her previous book The Nurture Assumption, especially the effect of birth order on personality and criticism of developmental psychology.
In The Nurture Assumption, JR Harris suggests that an individual's peer group significantly influences their intellectual and personal development.
She looks at studies which claim to show the influence of the parental environment and claims that most fail to control for genetic influences.
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In 1998, independent scholar Judith Rich Harris published The Nurture Assumption, in which she argued that scientific evidence, especially behavioral genetics, showed that all different forms of parenting do not have significant effects on children's development, short of cases of severe abuse or neglect.