 According to Vickers, when realists are presented with an instance of a (seemingly) success-inducing-yet-false hypothesis, all they need to do is to show that the specific hypothesis does not satisfy the above condition. It should be noted, however, that this, in essence, is the strategy recommended by Psillos in his 1994, where he aimed to show, using specific cases, that various assumptions such as that heat is a material substance in the case of the caloric theory of heat, do not merit realist commitment, because there are weaker assumptions that fuel the derivation of successful predictions. 