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Merits of randomised controlled trials in and psychosocial research do not fundamentally from those in clinical. that target behaviour are often and demanding, as are the requirements good randomised controlled trials to assess efficacy. the content and delivery of an in a trial may be more challenging justifying randomisation during informed. blinding of participants and researchers to allocation is impossible, it is important minimise bias through blinded assessment of outcome. contribution that participant choice makes to efficacy of an intervention is hard to measure.
Stephenson et al. (Sat,) studied this question.