Aaron Beck's theory that depression is caused by negative thinking, especially about oneself, and that negative thinking comes before the development of depression
Develop in childhood and adolescence as a result of rejection by parents or friends in the form of criticism and exclusion, or perhaps by the loss of a close family member
Provide a negative framework to view life in a pessimistic fashion
Over-generalisation where people with depression make a sweeping conclusion on the basis of a single event (e.g. he did not smile at me so he must hate me)