Better evidence about wicked issues in tackling health inequities

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Abstract
The need for better evidence continues to be emphasized by both researchers and users of research. ‘Better evidence for a better world’ was the theme of this year's Campbell Colloquium for example, a gathering of researchers and policy-makers who aim to systematically build the evidence on the effectiveness of social policies and programs, including those aimed at improving social welfare, reducing crime and improving educational outcomes. This resonates with continuing political interest in making policies more evidence informed. In keeping with this spirit of evidence-based enquiry, it is reasonable to consider what ‘better evidence’ might look like.