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Developmental research on:

• The development of relational and physical aggression.
• The development of prosocial behavior patterns.
• Relational and physical victimization.
• Aggression and victimization related peer difficulties.
• Familial factors related to the development or maintenance of aggression and victimization.
• Familial factors related to the development or maintenance of prosocial behavior.
• Aggression related social-psychological adjustment problems.
• The prevalence, incidence & stability of different types of aggression across time.