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This document 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 more efficient than the duo-trio test (described in ISO 10399), but has limited use with products that exhibit strong carryover and/or lingering flavours.

The method is applicable even when the nature of the difference is unknown [i.e. it determines neither the size nor the direction of difference between samples, nor is there any indication of the attribute(s) responsible for the difference]. The method is applicable only if the products are homogeneous.

The method is effective for:

a) determining that:

  1. either a perceptible difference results (triangle testing for difference);
  2. a perceptible difference does not result (triangle testing for similarity),

when, for example, a change is made in ingredients, processing, packaging, handling or storage;

b) selecting, training and monitoring assessors.


Общая информация 

  • Текущий статус
     : Опубликовано
    Дата публикации
     : 2021-03
  • Версия
     : 3
  • Технический комитет
     : ISO/TC 34/SC 12 Sensory analysis
  • ICS
     :
    67.240 Sensory analysis

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  2. Интернет-магазин
  3. Каталог стандартов
  4. ТК
  5. ISO/TC 34/SC 12
  6. ISO 4120:2021