1 Scope
This International Standard describes a procedure for statistically analysing data from forced-choice sensory discrimination tests, such as the Triangle, Duo-Trio, 3-AFC, 2-AFC, in which after every trial of the discrimination test the decision can be made to stop testing and declare a difference, to stop testing and declare no difference, or to continue testing.
The sequential method often allows for a decision to be made after fewer trials of the discrimination test than would be required by conventional approaches that use predetermined numbers of assessments.
The method is effective for
-
a) determining that
-
- either a perceptible difference results, or
-
- a perceptible difference does not result when, for example, a change is made in ingredients, processing, packaging, handling or storage;
-
-
b) or for selecting, training and monitoring assessors.