"...He re-evaluates cases that apparently require gradient alignment (unbounded stress and foot extrametricality), and finds no compelling evidence for gradient alignment.
This conclusion is reinforced by work in computational phonology suggesting that formally, gradient constraint evaluation is a rather questionable device (Riggle 2004; Biro´ 2004; Heinz, Kobele&Riggle 2005).
These modifications of classical foot alignment theory show an increased reliance on the grid, while remaining within representational assumptions of bracketed-grid theory.
Page 221; Chapter 9; Section 9.3.7
Kager, René (2007). Feet and metrical stress. In Paul de Lacy (ed.) The Cambridge Handbook of Phonology
. Cambridge, UK; New York, NY: Cambridge University Press, p.221.
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