Well there you have it, the four types have been defined in the simplest terms. However knowing the basic characteristics of the four is just the beggining of being able to understand them.
The thing that complicates understanding the most is the fact that no person is only one personality type. We all change from style to style depending on the situation we are confronted with. We will often reacte completely differently to a situation at work than we would if the same situation involved our friends or family.
The best advice I can give is to understand that everyone is going to be a little bit different and the best thing to do is get to know them and LISTEN. Listen to the things they say and how they are said and people will become much easier to understand.
These are my two cents on the evening,
Chuck