writing on how much evidence is needed to support public health policy raise important issues for all in public health, concluding many questions that are 'not issues of scientific fact, but issues of right and wrong'. To the discussion on evidence and values in health policy, I add the issue of 'right versus right' dilemmas in public health practice and consider its relevance to Public Health Associations (PHAs).The great success of evidence to test effectiveness in of medical care drives enthusiasm for 'evidence-based policy'. But public health interventions, unlike those in clinical medicine, need social change. Their effectiveness results from a mix of factors including leadership, changing environments, organizational history, and culture.2 It is rarely possible to test proposed public health actions in a controlled and measurable way. In public health, evidence -the ideas and definition -are complex, as Hurst, Borisch, and Mauron describe.