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Sensory Analysis Forced Choice Discrimination Test Methods Paired Difference testProtocal: Two samples presented; respondent asked to choose sample with higher level of some specified characteristic. Application: Most commonly used as “preference” test, as in “which sample is preferred?” Triangular test Protocal: Three samples presented simultaneously; two samples are the same; respondent asked to choose odd sample. Application: Statistical advantage over the paired difference test when differences are small—respondent can only guess correctly one-third of the time. Duo-Trio test Protocal: Three samples presented; two samples are the same; one is presented as the “reference”; respondent asked to identify sample that matches reference. Application: Statistical advantage over the paired difference test when differences are small—respondent can only guess correctly one-third of the time. Three-Alternative Forced Choice test Protocal: “Three” samples presented in succession; only two samples are actually used—the weakest of the two is presented twice; respondent asked to select “stronger” sample. Application: Most commonly used when samples vary in strength rather than character. A-not-A test Protocal: Respondent studies “control” materials until he or she believes either can identify the control characteristic consistently; respondent then asked to identify series of samples as “control” or “not control.” Application: Useful when the “standard” cannot be represented by a single product, or when the “control” sample can be recognized as the standard product even though it may have some variation. Multiple Standards test Protocal: Respondent given a test lot of product; asked whether it differs generically from a product type within which there is considerable variability. Application: Useful when the standard cannot be represented by a single product. The idea is to find the product that is more different from all others.
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