ABSTRACT
The aim of this research was to investigate the efficacy of Beck's cognitive therapy versus Teasdale's in treatment of dysthymia. Six subjects [two males and four females] were selected by convenient sampling and were randomly assigned to two treatment groups. The methodology was a multiple-baseline experimental single case study. Subjects completed Beck's Depression Inventory [BDI] and Depression-Anxiety-Stress Scale [DASS] at pre-treatment [baseline], treatment [4 and 8 sessions], post-treatment [twelfth session], and at follow-up [two months after treatment]. Also, subjects completed the Dysfunctional Attitude Scale [DAS], and the Internal-External Control Scale [IECS] at pre-treatment [baseline] and post-treatment [twelfth session]. The results revealed that both Beck's and Teasdale cognitive therapies were effective in decreasing dysthymic symptoms that was more prominent with the latter method. Teasdale's cognitive therapy can be more effective than Beck's in reducing dysthymic symptoms