Well, here are the different theories of intelligence from what I can remember:
Binet - He described intelligence as aged based.
Wechsler - He described intelligence as the ability to act on your surroundings encompassing verbal and performance abilities.
Gardener - He proposed numerous forms of intelligence in order to explain how someone could be good at music, but terrible at problem solving, and so on.
Sternberg - I forgot, but, I think it's a three way street his model.
CHC (Forgot the name) - Forgot.
What's your essay question?