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Plywood rigid diaphragms

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Just finished seaonc wood design seminar. An interesting issue was raised
regarding the design of shear walls and diaphragms.

According to the presenters, design engineers should consider the
horizontal wood diaphragms as rigid elements, and distribute the horizontal
shear to the shear walls based on a rigid analysis.

Of course at this time no one has any published data on the relative
rigidities of the shear walls other than longer walls are stiffer than
shorter walls!!!!

Does any one have any comments on this analysis approach for light frame
wood construction?

John Buchanan