Experimental Studies of the effects of the research process on participant behaviour

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A key national challenge for social science is to develop and evaluate cost effective health behaviour interventions that may have relatively small effects at the individual level, but which, when aggregated across a large population, produce a measurable benefit. The trials required to evaluate such interventions are typically subject to biases arising from study design and measurement of behaviour, and therefore result in poor estimates of efficacy and cost-effectiveness. By quantifying the extent to which aspects of the research process affect estimates of intervention efficacy, efforts to address national health priorities such as physical inactivity, smoking, hazardous drinking, and poor nutrition will be enhanced.