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In page Susan Sutherland Isaacs:

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However, Isaacs was not in favour of uncontrolled self-expression: rather, she stressed the importance in child development of the internalisation of what she called the “good-strict” parent – one able to control the child's instincts, and prevent their unrestrained force from harming self or other.[3] She also was one of the first to review and challenge Jean Piaget's stages of child development.[citation needed]