The rigorous testing of specific psychotherapies is difficult, in part because:

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The testing of psychotherapies is difficult because therapists cannot be blind to the type of therapy they are administering. This means that the therapist is aware of the treatment being given, which can potentially bias the results of the study. Additionally, it can be difficult to control for other factors that may be affecting the client's improvement, such as outside stressors or social support. While the other options may be obstacles to conducting research in this area, they are not the primary reason why testing specific psychotherapies is challenging.

The Rigorous Testing of Specific Psychotherapies Is Difficult, in Part