Searching on the web the other day i came across this website which houses a variety of sampling calculators. The metrics used in these calculators come from reserach performed by notable experts. I am curerntly looking into using this tool for selecting the correct usablity sample to use in navigation reserach.
Some notable references for the interface usability calculator are;
Lewis, James (2001) "Evaluation of Procedures for Adjusting Problm-Discovery Rates Estimated from Small Samples" in The International Journal of Human-Computer Interaction 13(4) p. 445-479
Turner, C. W., Lewis, J. R., and Nielsen, J. (2006). Determining usability test sample size. In W. Karwowski (Ed.), International Encyclopedia of Ergonomics and Human Factors (pp. 3084-3088). Boca Raton, FL: CRC Press.
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