A diagnostic classification for a wide variety of different behaviours (such as destructive behaviour and theft) that are expressed frequently and with intensity. Thus, while telling the odd lie may be considered wrong, it is not really indicative of an underlying conduct disorder. However, persistently telling large and often malicious lies may be. There is some evidence that conduct disorders may be transmitted genetically , although there is also a large body of evidence that abnormal family circumstances and the effects of parental discord and divorce also have a strong impact on their development. Conduct disorders are primarily disorders of childhood and adolescence, and in adulthood may develop into an anti-social personality disorder.