You may be upset for months because a friendly neighbor's loud music keeps you from getting to sleep at night. That's most accurately described as internal conflict. Actual interpersonal conflict requires that both parties know a disagreement exists, such as when you let the neighbor know that you don't appreciate the decibel level. You might say this in words. Or you might use nonverbal cues, as in giving the neighbor a mean look, avoiding him, or slamming your windows shut. One way or another, once both parties know that a problem exists, it's an inter- personal conflict.