 Michael Tye (2000) concedes that none of the abilities considered by Lewis is necessary for knowing what it is like and he discusses the following possible revision of the Ability Hypothesis: knowing what it is like to have an experience of red is the ability to apply an indexical concept to an experience of red (while having it) via introspection. But, he goes on to argue, this revised version can again be rejected by a counterexample that shows that the ability at issue is not sufficient for knowing what it is like: If Mary is distracted and does not attend to her experience when she first sees a red object, then she need not apply any concept to her experience at all. In this case, she still does not know what it is like to have red experiences although she has the ability to apply an indexical concept to her present experience (she has the ability, but, being distracted, she does not exercise it). Tye concedes that the revised version of the Ability Hypothesis could not, anyway, be used against the knowledge argument in the way that was originally intended. The reason is that the revised version is compatible with the view that Mary does acquire knowing-that if she is not distracted when first seeing something red: she learns that this is a red experience (where “this” refers introspectively to her present experience) and so acquires knowing-that. According to Tye to have indexical knowledge of this kind is sufficient but not necessary for knowing what it is like to have a red experience. After all, it is impossible to introspectively refer to a red experience without presently having that kind of experience, but Tye wishes to concede that a person can know what it is like to have a red experience while not presently having a red experience. This reasoning motivates his disjunctive account of knowing what it is like: “S knows what it is like to undergo experience E iff either S now has indexical knowledge-that with respect to E obtained via current introspection or S has the Lewis abilities with respect to E” (Tye 2000). Tye thus defends the physicalist view against the knowledge argument by a combination of the two strategies mentioned above: he applies the New Knowledge/Old Fact-strategy to the person who knows what it is like to have an experience in the sense of the first conjunct (the indexical thought at issue is made true by a physical fact) and he applies the No Propositional Knowledge-strategy to the case of someone who has knowing what it is like in the sense of the second disjunct.