What is main factor that affect profession selection process

Erikson's theory of personality grants more power to the than freud had allowed.

Why does c. wright mills identify critical thinking as one of the most important criteria for the development of intellectual craftsmanship? why is constantly being aware of the biased nature of your reactions and interactions (what c. wright mills calls self-reflexive) key to the development of that critical thinking? finally, why is keeping a file important, how can it lean to intellectual curiosity which can foster critical thinking and to develop a keen analytical mind?

If both the president and the vice president can no longer serve, who will become the next head of state?