We all took the Myers-Briggs personality test about 30 years ago as part of a work exercise among the management team. I tested as introvert, but close to the line. There are degrees of both. Extreme introverts and extreme extroverts are at the opposite sides of the scale. Those close to the line are able to cross over at times and usually are the easieast to get along with. Many of those who've posted above are close to the line - comfortable crossing back and forth. What I've learned over the years is extreme exroverts drive introverts nuts. Too loud and demonstrative. The more extreme extroverts have a hard time understanding introverts. They can misinterpret the extrovert's lack of over the top enthusiasm as being a stuckup prick. I've seen this play out a lot over the years, and understanding it helps understand why some people don't get along with or undersand other people.