A number of years ago, researchers noted that there seems to be 4 basic personality types: Analytic, Driver, Expressive and Amiable.    And, depending on whether you are a people person and how quickly you make decisions determines your personality type.

Along with this, it was determined that certain personality types are more compatible than others.  So, once you know your personality type and the classification system, you  can determine the likely hood of a compatible match.