date:Mar 01, 2013
est involves people sampling three products, such as three cookies, and giving their opinion on which one is different from the other two, such as in texture or flavor.
Now, General Mills has switched to a tetrad sensory test that involves four samples. After tasting all the samples, people pair them up, such as saying cookie No. 1 and cookie No. 3 taste the same while cookie No. 2 and cookie No. 4 taste the same. The change came after General Mills tried both triangle tests and tetrad tests on