I am trying to get some help answering the following questions:

How much good scientific support is there for the idea that there are two types of people - ambitious aggressive type As and mellow get-to-it later type Bs?

To what extent is this model culture specific (i.e. primarily found in Western societies?) What are some of the problems with assessing personality traits and types? If a person is Type A and has cardiovascular or other health problems, it is necessarily a problem that he or she is "Type A", or is there some other factor that might play a role? If you had a client or a patient who seemed to exhibit Type A behaviors, what type of coping strategies would you try to encourage in this person.