Two recent articles in this journal have discussed complex systems and differing views of occupational therapy as a complex intervention. This opinion piece develops the discussion of complex adaptive systems and complex interventions further, concluding that all health professions can claim to be complex. Complexity implies a degree of unpredictability. Within patient-centred systems, this means not that complexity cannot and should not be studied, but merely that variability will be experienced and needs to be understood and examined. The Medical Research Council framework provides a rational way of doing so. Research by occupational therapists should grasp this nettle to develop the profession's evidence base.
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