Fisk begins his discussion by asserting, that the FS model attempts to complete the SR model by accounting for the necessity with which, according to the SR model, a capacity will be exercised when certain operations are performed. He argues that the FS model ultimately fails in this task, and he seeks to improve upon the FS approach by grounding the relevant necessity in an entity's nature - a component that defenders of the FS model ignore or misinterpret. For the most part my comments will concern the general strategy of his paper rather than details of the arguments he offers.

Since the major focus of Fisk's paper is on the necessity with which, according to his description of the SR model, a capacity is exercised under certain conditions, it is worth emphasizing that this idea is pretty implausible.