Aloha Dien,

Great example for people. Gang-testing is smart.

"7 Steps to Freedom" by Ben Suarez also outlines gang-testing, but it deals more with physical products (bird houses, bonsai trees, garden tools).

SurveyMonkey.com is a good tool for running the test, because it has more features and is free if you are testing 100 or less respondents.

100 respondents has been a good enough test sample for me. It always presents a clear winner.

Aloha,

Jason