proposed four stages ' 'sensorimotor'' ''pre operational'' ''concrete operational'' ''formal operational'' though believe stages occurred given age many studies determined cognitive abilities take place ref name edpsych ref stages moral development piaget claimed logic morality develop constructive stages ref name higheststage ref expanding piaget 's work lawrence kohlberg determined process moral development principally concerned justice continued throughout individual 's lifetime ref name dissertation ref suggested three levels moral reasoning pre conventional moral reasoning conventional moral reasoning post conventional moral reasoning pre conventional moral reasoning typical
Social science Psychology Developmental psychology