Childhood

Klein on the very first time in life

Freud was interested in the sexual development of the child.

Piaget for the child's cognitive development

Undom

Elkind has written about developments and challenges in the adolescens

All life

Erikson was interested in the whole of his life, his wife added a 9th phase

Kohlberg interested in moral development

Fowler interested in the development of faith

General development models

Maslow was interested in adults in particular, whom he graded