Found:
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 productívity 
and prodúctiveness 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 (productívity). The derivation of productiveness is crucially different. First we put 
together pro-, duct, and -ive, then we apply the stress rules (prodúctive), and only then do we have the chance to add the Class II affix -ness, giving prodúctiveness. 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) |