Lakatos and Feyerabend have taken the underdetermination of theories to justify the claim that the only difference between empirically successful and empirically unsuccessful theories lies in the talents and resources of their respective advocates (i.e., with sufficient ingenuity, more or less any theory can be made to look methodologically respectable). Hesse and Bloor have claimed that underdetermination shows the necessity for bringing noncognitive, social factors into play in explaining the theory choices of scientists (on the grounds that methodological and evidential considerations alone are demonstrably insufficient to account for such choices). H. M. Collins, and several of his fellow sociologists of knowledge, have asserted that underdetermination lends credence to the view that the world does little if anything to shape or constrain our beliefs about it. (Laudan 1990: 321)