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Level Ordering Hypothesis

MORPHOLOGY: a hypothesis proposed in Siegel (1974) which takes the form in (i):

(i) Class I affixation
    Word Stress Rules
    Class II affixation
This hypothesis embodies the claim that affixation takes place in two linearly ordered blocks, which are separated by the word stress rules. EXAMPLE: the derivation of the English words productÝvity and prod˙ctiveness runs as follows. In the case of productivity, we first put together pro-, duct, -ive, and -ity (all Class I), and then we apply the stress rules (productÝvity). The derivation of productiveness is crucially different. First we put together pro-, duct, and -ive, then we apply the stress rules (prod˙ctive), and only then do we have the chance to add the Class II affix -ness, giving prod˙ctiveness. Since the affixation of -ness takes place after the stress rules have applied, it is correctly predicted that -ness cannot affect the stress already assigned to productive. Allen (1978) has replaced Siegel's Level Ordering Hypothesis by the more detailed Extended Level ordering Hypothesis.
LIT. Allen, M.R. (1978)
Siegel, D. (1974)