TY - JOUR JF - International Studies in the Philosophy of Science N2 - Russo and Williamson claim that establishing causal claims requires mechanistic and difference-making evidence. In this article, I will argue that Russo and Williamson's formulation of their thesis is multiply ambiguous. I will make three distinctions: mechanistic evidence as type vs object of evidence; what mechanism or mechanisms we want evidence of; and how much evidence of a mechanism we require. I will feed these more precise meanings back into the Russo-Williamson thesis and argue that it is both true and false: two weaker versions of the thesis are worth supporting, while the stronger versions are not. Further, my distinctions are of wider concern because they allow us to make more precise claims about what kinds of evidence are required in particular cases. © 2011 Open Society Foundation. SP - 139 A1 - Illari, PM AV - public IS - 2 VL - 25 UR - http://dx.doi.org/10.1080/02698595.2011.574856 ID - discovery1370009 Y1 - 2011/06// TI - Mechanistic evidence: Disambiguating the Russo-Williamson thesis EP - 157 N1 - This is an Accepted Manuscript of an article published by Taylor & Francis in International Studies in the Philosophy of Science on 27 July 2011, available online: http://wwww.tandfonline.com/10.1080/02698595.2011.574856. SN - 0269-8595 ER -