 According to Quine, speakers’ behavioral dispositions constrain what can be plausibly said about how to best regiment their language. He also allowed for some general constraints on interpretability that an idealized “field linguist” might impose in coming up with a regimented interpretation scheme.  (Donald Davidson  developed a similar line of thought in a less behavioristic idiom, speaking in terms of constraints on a “Radical Interpreter,” who seeks “charitable” construals of alien speech.) But unsurprisingly, this left ample room for “slack” with respect to which logical forms should be associated with a given sentential utterance.