The cluster A disorders are eccentric and odd. People usually see these behaviors as strange or even erratic. These behaviors can lead a person to have some or many social difficulties and an example of a cluster A disorder would be paranoid personality disorder.
Cluster B disorders are erratic and dramatic. People who have one of cluster B disorders have unpredictable behaviors and can react very dramatically to some mundane events. They are impulsive and one example would be antisocial personality disorder.
Cluster C disorders are fearful and anxious. People who have these would be afraid of some specific things and would seek to avoid those fears sometimes by many drastic means. An example would be avoidant personality disorder.
