1. Epistemic Benefit. The cognition delivers some significant epistemic benefit to a given subject at a given time, that is, it contributes to the acquisition, retention or use of relevant true beliefs.
2. No Relevant Alternatives. Alternative cognitions to the imperfect cognition are either unavailable or fail to deliver the same epistemic benefits as the imperfect cognition to that subject at that time.
In this post I will focus on the second condition, which requires further elucidation with respect to what notion of unavailability is in play.