ASTM E2610-08(2011)
(Test Method)Standard Test Method for Sensory Analysis—Duo-Trio Test
Standard Test Method for Sensory Analysis—Duo-Trio Test
SIGNIFICANCE AND USE
The test method is effective for the following test objectives:
To determine whether a perceivable difference results or a perceivable difference does not result, for example, when a change is made in ingredients, processing, packaging, handling or storage; or
To select, train and monitor assessors.
The test method itself does not change whether the purpose of the duo-trio test is to determine that two products are perceivably different versus that the products are not perceivably different. Only the selected values of pd, α, and β change. If the objective of the test is to determine if there is a perceivable difference between two products, then the value selected for α is typically smaller than the value selected for β. If the objective is to determine if the two products are sufficiently similar to be used interchangeably, then the value selected for β is typically smaller than the value selected for α and the value of pd is selected to define “sufficiently similar.”
The test method may change based on the test objective or the assessors’ familiarity with the product. The balanced-reference technique (see 9.1.1) typically is used when neither product is more familiar than the other. The constant-reference technique (see 9.1.2) frequently is used when one product is a control/current product or is familiar to the assessors.
SCOPE
1.1 This test method covers a procedure for determining whether a perceptible sensory difference exists between samples of two products.
1.2 This test method applies whether a difference may exist in a single sensory attribute or in several.
1.3 This test method is applicable when the nature of the difference between the samples is unknown. It does not determine the size or the direction of the difference. The attribute(s) responsible for the difference are not identified.
1.4 Compared to the triangle test, the duo-trio test is statistically less efficient, but easier to perform by the assessors. For details on how the duo-trio test compares to other three-sample tests, see Refs (1-4).
1.5 This test method is applicable only if the products are homogeneous. If two samples of the same product can often be distinguished, then another method, for example, descriptive analysis, may be more appropriate.
1.6 This test method is applicable only when the products do not cause excessive sensory fatigue, carryover or adaptation.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
General Information
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Standards Content (Sample)
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Designation: E2610 − 08 (Reapproved 2011)
Standard Test Method for
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Sensory Analysis—Duo-Trio Test
This standard is issued under the fixed designation E2610; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E456 Terminology Relating to Quality and Statistics
E1871 Guide for Serving Protocol for Sensory Evaluation of
1.1 This test method covers a procedure for determining
Foods and Beverages
whether a perceptible sensory difference exists between
E1885 Test Method for Sensory Analysis—Triangle Test
samples of two products.
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2.2 ISO Standards:
1.2 This test method applies whether a difference may exist
ISO 4120 Sensory Analysis—Methodology—Triangle Test
in a single sensory attribute or in several.
ISO 10399 Sensory Analysis—Methodology—Duo-Trio
Test
1.3 This test method is applicable when the nature of the
difference between the samples is unknown. It does not
3. Terminology
determine the size or the direction of the difference. The
attribute(s) responsible for the difference are not identified. 3.1 Definitions—For definition of terms relating to sensory
analysis, see Terminology E253, and for terms relating to
1.4 Compared to the triangle test, the duo-trio test is
statistics, see Terminology E456.
statistically less efficient, but easier to perform by the asses-
sors. For details on how the duo-trio test compares to other 3.2 Definitions of Terms Specific to This Standard:
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three-sample tests, see Refs (1-4). 3.2.1 α (alpha) risk—probability of concluding that a per-
ceptible difference exists when, in reality, one does not. (Also
1.5 This test method is applicable only if the products are
known as Type I Error or significance level.)
homogeneous. If two samples of the same product can often be
3.2.2 β (beta) risk—probability of concluding that no per-
distinguished, then another method, for example, descriptive
ceptible difference exists when, in reality, one does. (Also
analysis, may be more appropriate.
known as Type II Error.)
1.6 This test method is applicable only when the products
3.2.3 p —probability of a correct response.
do not cause excessive sensory fatigue, carryover or adapta- c
tion.
3.2.4 p (proportion of discriminators)—proportion of the
d
population represented by the assessors that can distinguish
1.7 This standard does not purport to address all of the
between the two products.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3.2.5 product—material to be evaluated.
priate safety and health practices and determine the applica-
3.2.6 sample—unit of product prepared, presented, and
bility of regulatory limitations prior to use.
evaluated in the test.
3.2.7 sensitivity—general term used to summarize the per-
2. Referenced Documents
formance characteristics of the test. The sensitivity of the test
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2.1 ASTM Standards:
is rigorously defined, in statistical terms, by the values selected
E253 Terminology Relating to Sensory Evaluation of Mate-
for α, β, and p .
d
rials and Products
3.2.8 triad—three samples given to an assessor in the
duo-trio test; one sample is labeled as a reference the other two
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This test method is under the jurisdiction ofASTM Committee E18 on Sensory
samples are labeled with different codes. One of the coded
Evaluation and is the direct responsibility of Subcommittee E18.04 on Fundamen-
tals of Sensory. samples is the same product as the reference. The other coded
Current edition approved Nov. 15, 2011. Published March 2012. Originally
sample is different.
approved in 2008. Last previous edition approved in 2008 as E2610 – 08. DOI:
10.1520/E2610-08R11.
4. Summary of Test Method
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The boldface numbers in parentheses refer to the list of references at the end of
this standard.
4.1 Clearly define the test objective in writing.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E2610 − 08 (2011)
4.2 Choose the number of assessors based on the level of evaluation). Experience and familiarity with the product and
sensitivity desired for the test. The sensitivity of the test is, in testmethodmayincre
...
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