Explain how each of the following stage theories has contributed to the view that midlife brings a crisis in development.

Costa and McCrae’s Baltimore study
Berkeley Longitudinal study
Helson’s Mills College study
George Vaillant’s study
Overall, what can be said about the stability of personality traits in mid-life?

Part 2: Explain how each of the following stage theories has contributed to the view that midlife brings a crisis in development.

Erikson’s stage of Generativity vs. Stagnation
Levinson’s Seasons of a Man’s Life