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Morality Wisdom & Life Span Essay title: Morality Wisdom & Life Span Developmental Psychology Chapter 7: Morality, Wisdom and the Life-span Moral Development and Life-span Research: -Longitudinal research: expensive, labor-intensive, takes a long time, research gets wrinkled and wither. -Cross-sectional research: more suitable for research on moral development across the life span. Definition of “Moral.