Introverts tend to internalize problems. In other words, we place the source of problems within and blame ourselves. Though introverts may also externalize and see others as the problem, it's more convenient to keep the problem "in house." Internalizers tend to be reliable and responsible, but we can also be very hard on ourselves.

Extroverts are more responsive to high-intensity and "happy" stimuli, which may be why an extrovert gets frustrated at the less "readable" face of the introvert.

Introverts keep their best stuff inside—that is, until it is ready. And this drives extroverts crazy! The explanation for the introvert’s behavior—and there must be an explanation for this behavior, say the extroverts—is that he or she is antisocial, out of touch, or simply a snob.

Introverts are generally more sensitive to low-intensity stimuli - they are mentally alerted to inputs that extroverts may miss.

When a quiet introvert talks, heads turn, and that's power.

Introverts are more effective leaders of proactive employees. When you have a creative, energetic work force, an introvert is going to draw out that energy better.

If the extrovert watches and listens a bit more, the introvert's true mood will become more evident.