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One of the biggest problems in evaluating psychological interventions is that even if a treatment appears to ‘work’ it can still be difficult to ascertain whether the results were a consequence of the treatment itself. The improvement might have occurred anyway, with or without the treatment, or the apparent benefits might have resulted from other factors, such as being able to discuss the difficulties with a professional who understands. Any treatment can lead to expectations
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Author(s): The Open University

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