 This disambiguation is of much value when we articulate the notion of ‘multi-track’ disposition. There seems to be a general agreement that there are so-called ‘multi-track’ conventional dispositions that correspond to more than one pair of stimulus condition and manifestation (Ryle 1949, pp. 43–45; Bird 2005a, p. 367; Bird 2007a, pp. 21–24; Ellis &amp; Lierse 1994, p. 29; Williams 2011, pp. 85–7; Vetter 2013). The thought is that exactly the same conventional dispositions may be picked out by multiple characterisations in terms of stimulus condition and manifestation. However, caution is required when we decide if a given disposition is multi-track or not. First of all, a single notion of stimulus condition must be in use: it is wrong to infer that the property of being poisonous is a multi-track disposition, from the fact that its stimulus condition could be being ingested, being ingested by humans, being ingested without finks, maskers, and so on. Further, we must hold the context of utterance fixed: it is wrong to infer that the property of being poisonous is multi-track, from the fact that its stimulus condition could be being ingested by humans, being ingested by dogs, being ingested by birds, and so on. The expression ‘poisonous’ is context-sensitive with respect to who \(x\) is poisonous to, referring to different dispositions relative to different contexts of utterance. Hence stimulus conditions like \(x\)’s being ingested by humans, \(x\)’s being ingested by dogs, etc., are not stimulus conditions of the same disposition. And hence they don’t have to do with the issue of whether or not a given disposition is multi-track.