A basic sense of the issues can be garnered from a look at Halle's one stated rule: “Shorten the head vowel of a branching foot.” This brief imperative fairly bristles with unasked questions. Why shorten rather than lengthen? indeed, why do anything at all? Why head rather than nonhead ? indeed, why not affect both? Why branching rather than nonbranching? indeed, why not operate on any foot? Ov...