BS EN ISO 10399:2018,Sensory Analysis – Methodology – Duo-Trio Test.BS EN ISO 10399:2018 pdf free download here.
BS EN ISO 10399:2018 specifies a procedure for determining whether a perceptible sensory difference or similarity exists between samples of two products. The method is a forced-choice procedure. The method is applicable whether a difference exists in a single sensory attribute or in several attributes.
The method is statistically less efficient than the triangle test (described in ISO 4120) but is easier to perform by the assessors.
2 Normative references
ISO 5492, Sensory analysis -Vocabulary.
ISO 8589, Sensory analysis – General guidance for the design of test rooms.
5 General test conditions and requirements
5.1 Clearly define the test objective in writing.
5.2 Carry out the test under conditions that prevent communication among assessors until all the evaluations have been completed using facilities and booths that conform with ISO 8589
5.3 Prepare the samples out of sight of the assessors and in an identical manner (i.e. same apparatus,same quantity of product).
5.4 Assessors shall not be able to identify the samples from the way in which they are presented. For example, in a taste test, avoid any differences in appearance. Mask any irrelevant colour differences using light filters and/or subdued illumination.