4 Personality Types

We are studying 4 personality types at work. We are to assess what personality type a customer is and adjust our pitch accordingly. Of course the world has more than 4 personality types and it is dangerous to categorize people in the real world. But I can't help thinking about the 4 personlity types outside of work. They are divided by cool or warm emotions (could also be extrovert and introvert) and then by speed of decision making (slow and careful or fast). The 4 types are Expressive, Amiable, Driver and Analytical. Of course it is rare for someone to be all one type and most people have bits of everything in them, depending on the circumstance, but in general, people have a dominant personlity, with facets that come out.

Expressive: Fast decision makers, high emotions
Amiable: Slow decision makers, high emotions
Drivers: Fast decision makers, low emotions
Analytical: Slow decision makers, low emotions