Health researchers commonly use the notion of complexity to indicate the problems faced in evaluating the effectiveness of many non-drug interventions.1-3 However, although it is rarely delineated, complexity has two meanings. In the first it is a property of the intervention, and in the second it is a property of the system in which the intervention is implemented. We examine the implications of these two views for economic evaluation.
This article has been published in the BMJ : Shiell, Alan, Hawe, Penelope and Gold, Lisa 2008-06-07, Complex interventions or complex systems? Implications for health economic evaluation, BMJ, vol. 336, no. 7656, pp. 1281-1283., and can also be viewed on the journal’s website at www.bmj.com
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