DeRose’s brand of EC is externalist, in the sense that it deploys a notion, sensitivity, that has figured in certain externalist theories of knowledge. Likewise externalist is Mark Heller’s brand of EC, which is both reliabilist in spirit and an instance of the RA approach. On Heller’s view (1995), just how reliable a belief-forming process must be for an attribution of “knowledge” to express a truth depends upon context, in the attributor sense introduced above; and the relevant alternatives are those such that, if the process in question is reliable to the contextually required degree, the subject will be able to discriminate between those alternatives and what is in fact the case.