While studying the healthy components of the personality, psychologists began to expand knowledge on the strange aspects of the personality. In the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), ten personality disorders were organized into three clusters: Cluster A, Cluster B, and Cluster C. Cluster A consists of the odd and eccentric disorders. These are paranoid, schizoid, and schizotypal. Cluster B are the dramatic, emotional, and erratic personality disorders. These are antisocial, borderline, histrionic and narcissistic. Cluster C is characterized by personality disorders dealing with anxiety or fear. This cluster are avoidant, dependent, and obsessive-compulsive.