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Many therapists cite case after case to support this method. 
Certainly, Cognitive Therapy has been shown to be effective with many 
depressed persons. There is relatively little objective, long-term 
research support for cognitive approaches provided by typical 
therapists, however. Perhaps this is because the method is much more 
complex than desensitization. Perhaps because it is hard to know for 
sure that the research subject's thinking has really changed. Perhaps 
because results are delayed--it takes time to change the thinking 
which modifies the emotions which then result in visible changes in 
behavior. Perhaps because there are several "cognitive" approaches, 
all taking a different attack on irrationality and perceptual bias.  
A study or two have found RET to be as effective as desensitization 
in dealing with fears; another study was inconclusive. As a self-help 
method (as distinguished from a therapy technique), there is very little 
evidence of its effectiveness. Ellis (1987) himself has observed that 
the effectiveness of books, including his own, "is still very limited." 
Some of the reasons are discussed above. On the other hand, there is 
a consensus among clinicians that cognitive therapy, which includes 
RET, is fairly effective with a variety of problems. But, it seems quite 
possible to me that others (e.g. a therapist) can detect our faulty 
thinking more adroitly than we can ourselves using written guidelines. 
We need extensive research.  
The advantages of this method are its (1) potential speed and 
directness, (2) conceptual simplicity, and (3) applicability to almost 
every emotion. There are no known dangers when attacking your own 
irrational ideas, but one might expect an argumentative, abrasive 
Rational-Emotional therapist to occasionally produce excessive stress 
and a "casualty."  
Recommended references  
Note--beyond the general references cited above, there are 
Rational-Emotive or Cognitive books that specialize in depression, 
anger, procrastination, relationships and many other areas. See the 
specific chapters of interest. Also there has been a new wave of books 
addressing harmful specific beliefs and ideas, such as pessimism 
(McKay & Fanning, 1991; Lazarus, Lazarus & Fay, 1993; McGinnis, 
1990; Seligman, 1991).  
These are the better books using some of the RET and cognitive 
therapy ideas: Burns, D. (1980); Butler, P. E. (1981); Dyer, W. 
(1976); Ellis, A. (1985b, 1987), Ellis, A. & Harper, R. A. (1975a); 
Freeman, A. & DeWolf, R. (1989) for overcoming regrets; Flanagan, C. 
M. (1990); Hauck, P. A. (1973, 1974, 1975); McMullin, R. E. (1986). 
The most recent good references are Young & Klosko (1993), Sills, J. 
(1993), McKay & Dinkmeyer (1994), Padesky & Greenberger (1995) 
and Greenberger & Padesky (1995). Miller (1995) takes a little 
different approach, he urges us to be happy with what we have.