ASTM E3009-23 pdf free download – Standard Test Method For Sensory Analysis—Tetrad Test.
This test method outlines a procedure for detecting whether a perceptible sensory difference exists between samples of two products, and for estimating the magnitude of such differences. It is applicable regardless of whether the difference is in a single sensory attribute or multiple attributes, and is particularly useful when the nature of the difference is unknown and the specific attributes responsible for the difference have not been identified. The tetrad test is statistically more efficient than the triangle test (Test Method E1885) or the duo-trio test (Test Method E2610).
7. Assessors
7.1 All assessors must be familiar with the mechanics of the tetrad test (the format, the task, and the procedure of evaluation). Experience and familiarity with the product and test method may increase the sensitivity of an assessor and may therefore increase the likelihood of finding a significant difference. Monitoring the performance of assessors over time may be useful.
7.2 Choose assessors in accordance with test objectives. For example, if the project results are to represent the general consumer population， assessors with unknown sensitivity might be selected. To increase protection of product quality, assessors with demonstrated acuity should be selected.
7.3 The decision whether or not to train assessors on the samples before testing should be addressed prior to testing.Training may include a preliminary presentation on the nature of the samples and the problem concerned. For example, if the test concerns the detection of a particular taint, consider the
inclusion of samples during training that demonstrate its presence and absence. Such demonstration will increase the
panel’s acuity for the taint but may detract from other differences. See STP 758 for details (4). Allow adequate time
between the exposure to the training samples and the actual tetrad test to avoid carryover.
7.4 During the test sessions, do not give any information about product identity, expected treatment effects, or individual performance until all testing is complete.
ASTM E3009-23 pdf free download – Standard Test Method For Sensory Analysis—Tetrad Test
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