The Diagnostic and Statistical Manual for Psychiatry (DSM-IV) groups personality disorders into three clusters.  Each cluster consists of personalities that have similar features.  A very brief list of the most common characteristics for each of the personality disorders will be given.

Cluster A

    Paranoid Personality Disorder
        *  a pervasive and unwarranted tendency to misinterpret the              actions of others as being demeaning or threatening
       * expects to be exploited by others
       * questions the loyalty and trust of friends and others
       * reads hidden meanings into benign remarks or actions
       * bears grudges
       * is reluctant to confide in others
       * is easily slighted, ready to counteract
       * questions the fidelity of spouse or sexual partner
       * has a poor sense of humor, seems angry all the time

     Schizoid Personality Disorder
          *  has a pervasive pattern of indifference to social and close 
              relationships
       * does not enjoy social contact or closeness
       * is a loner, aloof from others
       * prefers solitary activities
       * does not have a wide range of feelings
       * does not care about praise or criticism
       * appears cold and indifferent

     Schizotypal Personality Disorder
          *  has a pervasive pattern of problems in interpersonal relationships
       * has a peculiar pattern of thinking
       * is very superstitious, believes in things like mind control, clairvoyance
       * is very anxious in social situations
       * has few close friends
       * is suspicious of others
       * appears odd or eccentric to others
       * often has trouble expressing self, manner of speaking may be  odd
       * shows little emotional expression