[Sigia-l] Card sorting with complex content

[c/j]

Hi all, 

I'm redesigning a large content-rich site with
multiple diverse audience segments. I've gone through
a couple iterations of the proposed taxonomy, but now
need to do some testing and validation with the
identified segments. 

Does anyone know of any research that specifies the
number of individuals needed for a card sort in order
for the findings to be somewhat "valid"? I've found
some work on this topic, but in each case the
audiences are fairly homogenous. My sense is that I
should be able to get away with a fairly low number
within each major segment (perhaps around 3) but I
haven't been able to find anything confirming or
falsifying this assumption. 

Any ideas?  Thanks in advance - 

c/j

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