They are perfectionistic and have a need to be in control. Obsessive-compulsive personality disorder: people with this disorder are preoccupied by rules, orderliness and value work above other aspects of life.Avoidant personality disorder: people with this disorder avoid social interaction and are extremely sensitive to negative judgements by others they may be timid and socially isolated with feelings of inadequacy.General features of these disorders include anxious and fearful thoughts and behaviour: Narcissistic personality disorder: a pattern of inflated self-esteem, need for admiration, lack of empathy or concern for others, and fantasies of success, power or beauty.Borderline personality disorder: the main features include fear of abandonment, intense and unstable relationships, extreme emotional outbursts, deliberate self-harm or self-destructive behaviour and a fragile sense of self or identity.Histrionic personality disorder: people with this disorder are highly emotional and dramatic, have an excessive need for attention and approval, and may be obsessed with their appearance.Antisocial personality disorder: this disorder may cause a disregard for the law or for the rights of others, with a lack of remorse, including lying and stealing, aggression, violence or illegal behaviour.General features of this cluster group include unstable emotions and dramatic or impulsive behaviours: Schizotypal personality disorder: this may cause people to behave eccentrically, have peculiar dress, have unusual or bizarre thoughts and beliefs, feel discomfort in social settings, and have trouble forming close relationships.Schizoid personality disorder: this disorder causes someone to lack interest in social relationships and have an unemotional response to social interactions.Paranoid personality disorder: people with this disorder are suspicious and mistrustful of others, interpret other people’s motives as harmful, and may be hostile or emotionally detached.People with this type of disorder are generally described as having 'odd' or 'eccentric' thoughts or behaviours:

One of the main classification systems groups personality disorders into 3 main 'clusters'. Some people may also show features of more than one personality disorder.

So, some people may have some features of a personality disorder without having the entire disorder. Generally, they agree that personality disorders lie on a spectrum, along with normal personality traits. Our findings showed a significant improvement in depression, anger, perceived anxiety control, and global functioning.There are different ways to classify personality disorders, and experts often disagree about the best way to group them together. In this work we present preliminary findings of the efficacy of a six-month DBT-based program for the treatment of four patients with a diagnosis of cluster C personality disorder. DBT could be a useful approach for the treatment of these disorders, given that its main targets are emotion regulation difficulties. These features are opposite to the features of BPD (i.e., emotional constriction vs emotional dysregulation, overcontrolled behavior vs impulsive behavior, etc.). These disorders are characterized also by difficulties in emotion regulation: being emotionally constricted, overcontrolled, cognitively rigid, and behaviorally avoidant and include obsessive-compulsive personality disorder (OCPD) and avoidant personality disorder (APD). There is a set of personality disorders belonging to cluster C (DSM-IV-TR, APA, 2000) that represent the dialectical opposite of BPD and related disorders. Dialectical behavior therapy (DBT) has been proposed as a useful treatment for a wide range of clients with symptoms functionally similar to those of borderline personality disorder (BPD), having in common pervasive emotion dysregulation.

Personality clusters