EVS-EN ISO 4120:2021

Sensory analysis - Methodology - Triangle test (ISO 4120:2021)

General information
Valid from 01.04.2021
Base Documents
ISO 4120:2021; EN ISO 4120:2021
Directives or regulations
Standard history
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: - either a perceptible difference results (triangle testing for difference); - 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.
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Standard monitoring
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