Introduction: Moral development study in the 21st century / Carolyn Pope Edwards and Gustavo Carlo -- Human morality and temperament / Jerome Kagan -- The roots of goodness: the fulfillment of basic human needs and the development of caring, helping and nonaggression, inclusive caring, moral courage, active bystandership, and altruism born of suffering / Ervin Staub -- The development of empathy-related responding / Nancy Eisenberg -- The neo-Kohlbergian tradition and beyond: schemas, expertise, and character / Darcia Narvaez -- The development of moral identity / Daniel Hart -- Motivation and moral development: a trifocal perspective / F. Clark Power