Extrovert, its not just about social life or being outgoing, Its mostly about how you deal with information.
A good way to know if your an introvert, or extrovert, outside any social setting is how you come to come to a conclusion on a point in a group setting.
- An extrovert, will think his position profoundly and then give a well thought off answer. It will then be very hard to move you from this position. This is very often seen in high levels engineers (my background). The answer will have a sound base from prior information, but since it doesn't incorporate
many different point of views, it will be narrowly focused.
- An extravert will launch ideas, half baked solutions, he will "think out loud", he will welcome input from al comers and can be swayed with a persuasive argument introduced while he's hashing it out. The solution is often, not as theoritically sound, but much more inclusive and as such has a better chance of being accepted by all (that its the "best" solution, may or may not enter the picture).
Of course, Extroverts will drive introverts up the walls with their constant need to talk thing out. Extroverts will get tired by constantly trying to get the information and answers they need to feel comfortable about a decision from introverts.